Astrology furnishes a splendid proof of the contemptible subjectivity of men in consequence whereof they refer everything to themselves and from every idea at once go straight back to themselves. Astrology refers the course of celestial bodies to the miserable ego; it also establishes a connection between the comets in heaven and the squabbles and rascalities on earth.

Patriotism, when it wants to make itself felt in the domain of learning, is a dirty fellow who should be thrown out of doors.

It is difficult to keep quiet if you have nothing to do

The discovery of truth is prevented more effectively, not by the false appearance things present and which mislead into error, not directly by weakness of the reasoning powers, but by preconceived opinion, by prejudice.

Materialism is the philosophy of the subject who forgets to take account of himself.

For the purpose of acquiring gain, everything else is pushed aside or thrown overboard, for example, as is philosophy by the professors of philosophy.

Not to go to the theater is like making one's toilet without a mirror.