Some people come by the name of genius in the same way that certain insects come by the name of centipede -- not because they have a hundred feet, but because most people can't count above 14.

An hour-glass is a reminder not only of time's quick flight, but also of the dust to which we must at last return

The worst thing you can possibly do is worrying and thinking about what you could have done.

A vacuum of ideas affects people differently than a vacuum of air, otherwise readers of books would be constantly collapsing.

To many people virtue consists chiefly in repenting faults, not in avoiding them.

Nothing puts a greater obstacle in the way of the progress of knowledge than thinking that one knows what one does not yet know.

He who is in love with himself has at least this advantage - he won't encounter many rivals.