What is surprising is not that oppression should make its appearance only after higher forms of economy have been reached, but that it should always accompany them.

Whoever is uprooted himself uproots others. Whoever is rooted himself doesn't uproot others.

The joy of learning is as indispensable in study as breathing is in running. Where it is lacking there are no real students, but only poor caricatures of apprentices who, at the end of their apprenticeship, will not even have a trade.

It is only from the light which streams constantly from heaven that a tree can derive the energy to strike its roots deep into the soil. The tree is in fact rooted in the sky.

Academic work is one of those fields which contain a pearl so precious that it is worth while to sell all our possessions, keeping nothing for ourselves, in order to be able to acquire it.

The right to kill: supposing the life of X ... were linked with our own so that the two deaths had to be simultaneous, should we still wish him to die? If with our whole body and soul we desire life and if nevertheless without lying, we can reply 'yes'> then we have the right to kill.

Modern life is given over to immoderation. Immoderation invades everything: actions and thought, public and private life.