If people would dare to speak to one another unreservedly, there would be a good deal less sorrow in the world a hundred years hence.

There is no such source of error as the pursuit of truth.

To himself everyone is immortal; he may know that he is going to die, but he can never know that he is dead.

Logic is like the sword - those who appeal to it, shall perish by it.

If you follow reason far enough it always leads to conclusions that are contrary to reason.

Parents are the last people on earth who ought to have children.

In the midst of vice we are in virtue, and vice versa.