It is easy to hate and it is difficult to love. This is how the whole scheme of things works. All good things are difficult to achieve; and bad things are very easy to get.

I think; therefore I am.

Illusory joy is often worth more than genuine sorrow.

The greatest minds are capable of the greatest vices as well as of the greatest virtues.

Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.

The reading of all good books is like a conversation with the finest minds of past centuries.