Sanity consists in not being subdued by your means. Fancy prices are paid for position, and for the culture of talent, but to thegrand interests, superficial success is of no account.
Mathematics is an obscure field, an abstruse science, complicated and exact; yet so many have attained perfection in it that we might conclude almost anyone who seriously applied himself would achieve a measure of success.
Courage is not having the strength to go on, it is going on when you don't have the strength. Industry and determination can do anything that genius and advantage can do and many things that they cannot.
One should guard against preaching to young people success in the customary form as the main aim in life. The most important motive for work in school and in life is pleasure in work, pleasure in its result, and the knowledge of the value of the result to the community.
Begin and proceed on a settled conviction that but little is permitted to any man to do or to know, and if he complies with the first grand laws, he shall do well.
I've come to embrace the notion that I haven't done enough in my life. I've come to confirm that one's title, even a title like president of the United States, says very little about how well one's life has been led. No matter how much you've done or how successful you've been, there's always more to do, always more to learn, and always more to achieve.