Facts are stubborn, but statistics are more pliable.

To avoid being drawn into error, keep a firm grip on the truth.

There's plenty of boys that will come hankering and gruvvelling around when you've got an apple, and beg the core off you; but when they're got one, and you beg for the core, and remind them how you give them a core one time, they take a mouth at you, and say thank you 'most to death, but there ain't a-going to be no core.

Thousands of geniuses live and die undiscovered - either by themselves or by others.

My kind of loyalty was loyalty to one's country, not to its institutions or its office-holders.

When even the brightest mind in our world has been trained up from childhood in a superstition of any kind, it will never be possible for that mind, in its maturity, to examine sincerely, dispassionately, and conscientiously any evidence or any circumstance which shall seem to cast a doubt upon the validity of that superstition. I doubt if I could do it myself.

...heaven for climate, and hell for society.