A friend is someone who knows all about you and still loves you.
Professor [John] Tyndall once said the finest inspiration he ever received was from an old man who could scarcely read. This man acted as his servant. Each morning the old man would knock on the door of the scientist and call, 'Arise, Sir: it is near seven o'clock and you have great work to do today.
Sunday, with its immunity from work, was devised for slaves who got out of all the work they could during the week.
Do not take life too seriously. You will never get out of it alive.
Every man is a damn fool for at least five minutes every day; wisdom consists in not exceeding the limit.
There is no failure except in no longer trying.
So long as governments set the example of killing their enemies, private individuals will occasionally kill theirs.
God will not look you over for medals, degrees or diplomas but for scars.
I would rather be able to appreciate things I cannot have than to have things I am not able to appreciate.
This will never be a civilized country until we expend more money for books than we do for chewing gum.
The line between failure and success is so fine. . . that we are often on the line and do not know it.
I do not read a book; I hold a conversation with the author.
Science is simply the classification of the common knowledge of the common people. It is bringing together the things we all know and putting them together so we can use them. This is creation and finds its analogy in Nature, where the elements are combined in certain ways to give us fruits or flowers or grain.