Nothing reveals a man's character better than the kind of joke at which he takes offense.

One of our forefathers must have read a forbidden book.

If we thought more for ourselves we would have very many more bad books and very many more good ones.

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

Just as the performance of the vilest and most wicked deeds requires spirit and talent, so even the greatest demand a certain insensitivity which under other circumstances we would call stupidity.

It is too bad if you have to do everything upon reflection and can't do anything from early habit.

There exists a species of transcendental ventriloquism by means of which men can be made to believe that something said on earth comes from Heaven.