Let mental culture go on advancing, let the natural sciences progress in even greater extent and depth, and the human mind widen itself as much as it desires: beyond the elevation and moral culture of Christianity, as it shines forth in the Gospels, it will not go.

To be active is the primary vocation of man.

To live as one likes is plebian the noble man aspires to order and law.

Deny yourself! You must deny yourself! That is the song that never ends.

What we agree with leaves us inactive, but contradiction makes us productive.

What is important in life is life, and not the result of life.

Idea and experience will never coincide in the center; only through art and action are they united.