„I have learned that success is to be measured not so much by the position that one has reached in life as by the obstacles which he has overcome while trying to succeed.“

„I learned this, at least, by my experiment; that if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours..“

—  Henry David Thoreau 1817-1862 American poet, essayist, naturalist, and abolitionist 1817 - 1862

Вариант: I learned this, at least, by my experiment: that if one advances confidently in the direction of his dreams, and endeavors to live the life which he has imagined, he will meet with a success unexpected in common hours.
Источник: Walden: Or, Life in the Woods

„For honest merit to succeed amid the tricks and intrigues which are now so lamentably common, I know is difficult; but the honor of success is increased by the obstacles which are to be surmounted. Let me triumph as a man or not at all.“

—  Rutherford B. Hayes American politician, 19th President of the United States (in office from 1877 to 1881) 1822 - 1893

Diary (7 November 1841)

„Every new & successful example therefore of, is of importance. And I have no doubt that every new example, will succeed, as every past one has done, in shewing that.

[]“

—  James Madison 4th president of the United States (1809 to 1817) 1751 - 1836

Источник: James Madison: Writings

„Time and persistence has shown me that I can succeed at sharing my art with others as a musician while running my own music business. And that kind of success is as good as I could have ever wished for.“

—  Bradley Joseph Composer, pianist, keyboardist, arranger, producer, recording artist 1965

[Janus, Cicily, Radinsky, Ned, http://newfaceofjazz.com/?page_id=594, New Faces of Jazz: Bradley Joseph, (newfaceofjazz.com), 2010-08-01]

„Attitude is the first quality that marks the successful man. If he has a positive attitude and is a positive thinker, who likes challenges and difficult situations, then he has half his success achieved.“

—  John C. Maxwell American author, speaker and pastor 1947

Источник: The Success Journey: The Process of Living Your Dreams

„The learner has to realize that he or she is the one who sets the objective, the learning tasks and the stage for success.“

—  Sukavich Rangsitpol Thai politician 1935

The Learner

„Try not to measure your success by the success of others. Success should be defined by one person…Yourself.“

—  Lupe Fiasco rapper 1982

Rules 2 Rule

„There are always obstacles and competitors. There is never an open road, except the wide road that leads to failure. Every great success has always been achieved by fight. Every winner has scars. The men who succeed are the efficient few. They are the few who have the ambition and will power to develop themselves.“

—  Herbert N. Casson Canadian journalist and writer 1869 - 1951

Herbert N. Casson in: National Printer Journalist Vol 51 (1933), Nr. 7-12. p. 28; Cited in Arthur Tremain (1951) Successful Retailing: A Handbook for Store Owners and Managers p. xi
1920s-1940s

„Knowledge is proud that he has learned so much;
Wisdom is humble that he knows no more.“

—  William Cowper, The Task

Источник: The Task (1785), Book VI, Winter Walk at Noon, Line 92.
Контексте: Knowledge, a rude unprofitable mass,
The mere materials with which wisdom builds,
Till smoothed and squared and fitted to its place,
Does but encumber whom it seems to enrich.
Knowledge is proud that he has learned so much;
Wisdom is humble that he knows no more.
Books are not seldom talismans and spells.

„Education is that which remains, if one has forgotten everything he learned in school.“

—  Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955

Einstein did write this quote in "On Education" from 1936, which appeared in Out of My Later Years, but it was not his own original quip, he attributed it to an unnamed "wit".
Very popular in French: "La culture est ce qui reste lorsque l’on a tout oublié" (Culture is that which remains, if one has forgotten everything). Attributed in French to Édouard Herriot (1872-1957) and, in English, sometimes to Ortega y Gasset. Another French variant is "la culture est ce qui reste lorsqu'on a oublié toutes les choses apprises" (Culture is that which remains if one has forgotten everything one has learned), which appears in the 1912 book Propos Critiques by Georges Duhamel, p. 14 http://books.google.com/books?id=Xpk_AAAAIAAJ&q=%22la+culture+est+ce+qui+reste+lorsqu%27on+a+oubli%C3%A9+toutes+les+choses+apprises%22#search_anchor. And another English variant is "Culture is that which remains with a man when he has forgotten all he has learned" which appears in The Living Age: Volume 335 from 1929, p. 159 http://books.google.com/books?id=tHFRAAAAYAAJ&q=%22Culture+is+that+which+remains+with+a+man+when+he+has+forgotten+all+he+has+learned%22#search_anchor, where it is attributed to "Edouard Herriot, French Minister of Education". Another English variant is "Education is that which remains behind when all we have learned at school is forgotten", which appears in The Education Outlook, vol. 60 p. 532 http://books.google.com/books?id=dNcgAQAAMAAJ&pg=RA1-PA532#v=onepage&q=%22education%20is%20that%20which%20remains%22&f=false (from an issue dated 2 December 1907), where it is attributed to Ralph Waldo Emerson.
The saying is found in an 1891 article by Swedish writer Ellen Key https://en.wikipedia.org/wiki/Ellen_Key, "Själamorden i skolorna", which was published in the journal "Verdandi", no. 2, pages 86-98 (the saying is on p. 97). The same article was republished later as a chapter in her 1900 book "Barnets Århundrade". Here is the quote in Swedish ( p. 160 https://archive.org/stream/barnetsrhundrade02ellenkey#page/n167/mode/2up): Men bildning är lyckligtvis icke blott kunskap om fakta, utan enligt en ypperlig paradox: »det, som är kvar, sedan vi glömt allt, vad vi lärt». Here it is from the 1909 English translation of the book ( p. 231 https://archive.org/stream/centurychild00frangoog#page/n246/mode/2up): "But education happily is not simply the knowledge of facts, it is, as an admirable paradox has put it, what is left over after we have forgotten all we have learnt." From the way Ellen Key puts it, she doesn’t take credit for the saying, but rather refers to it as an already known “paradox” that she explicitly puts between quotation marks.
Misattributed

„I became quietly seized with that nostalgia that overcomes you when you have reached the middle of your life and your father has recently died and it dawns on you that when he went he took some of you with him.“

—  Bill Bryson American author 1951

Источник: The Lost Continent: Travels in Small Town America

„The problem in public life is learning to overcome terror; the problem in married life is learning to overcome boredom.“

—  Gabriel García Márquez, книга Love in the Time of Cholera

Источник: Love in the Time of Cholera

„The long hours spent with them in the forest have enriched my life beyond measure. What I have learned from them has shaped my understanding of human behavior, of our place in nature.“

—  Jane Goodall British primatologist, ethologist, and anthropologist 1934

Referring to chimpanzees, reported in Jane Goodall: Primatologist and Animal Activist (2009) by Connie Jankowski, p. 13

„A person's success in life can usually be measured by the number of uncomfortable conversations he or she is willing to have.“

—  Timothy Ferriss, книга The 4-Hour Workweek

The 4-Hour Workweek (2007)

„When a spirit has reached the end of the term assigned by Providence to his errant life, he chooses for himself the trials which he determines to undergo in order to hasten his progress - that is to say, the kind of existence which he believes will be most likely to furnish him with the means of advancing and the trials of this new existence always correspond to the faults which he has to expiate. If he triumphs in this new struggle, he rises in grade; if he succumbs, he has to try again.“

—  Allan Kardec systematizer of Spiritism 1804 - 1869

Источник: The Spirits' Book, p. 202.

„The culture and civilization of the White man are essentially material; his measure of success is, "How much property have I acquired for myself?" The culture of the Red man is fundamentally spiritual; his measure of success is, "How much service have I rendered to my people?“

—  Ernest Thompson Seton British/ American author, artist, and a founder of the scouting movement 1860 - 1946

„One sticks to an opinion because he prides himself on having come to it on his own, and another because he has taken great pains to learn it and is proud to have grasped it: and so both do so out of vanity.“

—  Friedrich Nietzsche German philosopher, poet, composer, cultural critic, and classical philologist 1844 - 1900

„It is normal that I have done something significant and so have other artists. I have taken my work in such a way that it has been a success. But that is not the only thing which matters you see…it's the work which matters.“

—  S. H. Raza Indian artist 1922 - 2016

„The victim should have the right to end his life, if he wants. But I think it would be a great mistake. However bad life may seem, there is always something you can do, and succeed at. While there's life, there is hope.“

—  Stephen Hawking British theoretical physicist, cosmologist, and author 1942 - 2018

On voluntary euthanasia as quoted in People's Daily Online (14 June 2006) http://english.people.com.cn/200606/14/eng20060614_273839.html