Speech is human nature itself, with none of the artificiality of written language.

If a dog jumps into your lap, it is because he is fond of you but if a cat does the same thing, it is because your lap is warmer.

Religion is the last refuge of human savagery.

It is the business of the future to be dangerous and it is among the merits of science that it equips the future for its duties.

No one who achieves success does so without acknowledging the help of others. The wise and confident acknowledge this help with gratitude.

Civilization advances by extending the number of important operations which we can perform without thinking of them.

Knowledge shrinks as wisdom grows.

Wisdom alone is true ambition's aim, wisdom is the source of virtue and of fame obtained with labour, for mankind employed, and then, when most you share it, best enjoyed.