It is much more comfortable to be mad and know it, than to be sane and have one’s doubts. (G. B. Burgin)

Only two things are infinite, the universe and human stupidity, and I’m not sure about the former. (Albert Einstein)

Each problem that I solved became a rule which served afterwards to solve other problems. (Rene Descartes, Discours de la Methode)

Do, or do not.There is no ‘try’. (Yoda)

I find that the harder I work, the more luck I seem to have. (Thomas Jefferson)

The only way to get rid of a temptation is to yield to it. (Oscar Wilde)

The optimist proclaims that we live in the best of all possible worlds, and the pessimist fears this is true. (James Branch Cabell)

Talent does what it can; genius does what it must. (Edward George Bulwer-Lytton)