Whenever he composes a critical review, I have been told, he gets an enormous erection.

Much reading has brought upon us a learned barbarism.

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

I have often noticed that when people come to understand a mathematical proposition in some other way than that of the ordinary demonstration, they promptly say, "Oh, I see. That's how it must be." This is a sign that they explain it to themselves from within their own system.

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.

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.

What is called an acute knowledge of human nature is mostly nothing but the observer's own weaknesses reflected back from others.