It is a mathematical fact that the casting of this pebble from my hand alters the centre of gravity of the universe.
Man is a tool-using animal. . . Without tools he is nothing, with tools he is all.
The end of a man is action and not a thought, though it were the noblest.
What is all knowledge too but recorded experience, and a product of history; of which, therefore, reasoning and belief, no less than action and passion, are essential materials?
'Genius' (which means transcendent capacity of taking trouble, first of all).
A judicious man uses statistics, not to get knowledge, but to save himself from having ignorance foisted upon him.
Teaching school is but another word for sure and not very slow destruction.
A witty statesman said, you might prove anything by figures.
He that has a secret should not only hide it, but hide that he has it to hide.
Our main business is not to see what lies dimly in the distance, but to do what lies clearly at hand.
The block of granite which is an obstacle in the pathway of the weak, becomes a stepping-stone in the pathway of the strong.
There is precious instruction to be got by finding we were wrong.
When the oak is felled the whole forest echoes with its fall, but a hundred acorns are downed in silence by an unnoticed breeze.