Seize opportunity by the beard, for it is bald behind.
Always be nice to those younger than you, because they are the ones who will be writing about you.
I am more and more convinced that our happiness or unhappiness depends more on the way we meet the events of life than on the nature of those events themselves.
Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.
Nothing contributes so much to tranquilizing the mind as a steady purpose - a point on which the soul may fix its intellectual eye.
A man is too apt to forget that in this world he cannot have everything. A choice is all that is left him.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...'