A clever person solves a problem. A wise person avoids it.

Necessity is the mother of all invention.

If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut

(Reply on what constitutes scientific proof:)"The question is much too difficult for me.

You can never solve a problem on the level on which it was created. Insanity: doing the same thing over and over again and expecting different results. A life lived for others is a life worthwhile.

God Almighty does not throw dice.

To a student: Dear Miss - I have read about sixteen pages of your manuscript . . . I suffered exactly the same treatment at the hands of my teachers who disliked me for my independence and passed over me when they wanted assistants. . . . Keep your manuscript for your sons and daughters, in order that they may derive consolation from it and not give a damn for what their teachers tell them or think of them. . . . There is too much education altogether.