“Power in the hands of one who did not acquire it gradually, is often fatal to success.”

— Napoleon Hill , book Think and Grow Rich

Source: Think and Grow Rich (1938)
Context: Sons and daughters of wealthy men, and others who inherit money which they did not earn...

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Napoleon Hill 104

American author 1883–1970

Ali book Nahj al-Balagha

Nahj al-Balagha

“For every year of formal education, one is provided a key to success. The more keys one acquires, the more likely; success.”

Gandolfo – (RJ Intindola)

1979

“At school and college the success in the classes was the only indication of my powers. All else that I intended or did was within or carefully hidden. The reserved character, as I have often thought, is not pleasant nor lovely. But is it not necessary to one such as I?”

William Stanley Jevons (1835–1882) English economist and logician

Reflections on his earlier life, written when he was 27 (December 1862), published in Letters and Journal of W. Stanley Jevons (1886), edited by Harriet A. Jevons, his wife, p. 13.
Context: It was during the year 1851, while living almost unhappily among thoughtless, if not bad companions, in Gower Street a gloomy house on which I now look with dread it was then, and when I had got a quiet hour in my small bedroom at the top of the house, that I began to think that I could and ought to do more than others. A vague desire and determination grew upon me. I was then in the habit of saying my prayers like any good church person, and it was when so engaged that I thought most eagerly of the future, and hoped for the unknown. My reserve was so perfect that I suppose no one had the slightest comprehension of my motives or ends. My father probably knew me but little. I never had any confidential conversation with him. At school and college the success in the classes was the only indication of my powers. All else that I intended or did was within or carefully hidden. The reserved character, as I have often thought, is not pleasant nor lovely. But is it not necessary to one such as I? Would it have been sensible or even possible for a boy of fifteen or sixteen to say what he was going to do before he was fifty? For my own part I felt it to be almost presumptuous to pronounce to myself the hopes I held and the schemes I formed. Time alone could reveal whether they were empty or real; only when proved real could they be known to others.

“The power of attending to what is spoken, or in other words the power of listening, is one of the most useful habits that we can acquire; it keeps the mind active, and we can thus learn not only by hearing, but by reading and reflection, by fixing our minds steadily on the matter which we wish to master. It is… in a great degree, the sure means of success in all that we undertake; and if the power is not acquired early in life, great labour will be necessary to acquire it afterwards.”

George Long (1800–1879) English classical scholar

An Old Man's Thoughts on Many Things, Of Education I

“Success is not final, failure is not fatal: it is the courage to continue that counts.”

Winston S. Churchill (1874–1965) Prime Minister of the United Kingdom

Attributed to Winston Churchill in The Prodigal Project : Book I : Genesis (2003) by Ken Abraham and Daniel Hart, p. 224 and other places, though no source attribution is given. It actually derives from an advertising campaign for Budweiser beer in the late 1930s.
Misattributed
Variant: Success is not final, failure is not fatal: it is the courage to continue that counts.
Source: http://quoteinvestigator.com/2013/09/03/success-final/