Man is a tool-making animal

The greatest inventions are those inquiries which tend to increase the power of man over matter.

Passion governs, and she never governs wisely.

I think also, that general virtue is more probably to be expected and obtained from the education of youth, than from exhortations of adult persons; bad habits and vices of the mind being, like diseases of the body, more easily prevented than cured. I think moreover, that talents for the education of youth are the gift of God; and that he on whom they are bestowed, whenever a way is opened for use of them, is as strongly called as if he heard a voice from heaven.

You may delay, but time will not.

I never knew a man who was good at making excuses who was good at anything else.

Old boys have their playthings as well as young ones; the difference is only in the price.