By my existence I am nothing more than an empty place, an outline,that is reserved within being in general. Given with it, though, is the duty to fill in this empty place. That is my life.

Nothing more can be attempted than to establish the beginning and the direction of an infinitely long road. The pretension of any systematic and definitive completeness would be, at least, a self-illusion. Perfection can here be obtained by the individual student only in the subjective sense that he communicates everything he has been able to see.

The deepest problems of modern life derive from the claim of the individual to preserve the autonomy and individuality of his existence in the face of overwhelming social forces, of historical heritage, of external culture, and of the technique of life.

Man's nature, originally good and common to all, should develop unhampered.

He is educated who knows how to find out what he doesn't know.

The psychological basis of the metropolitan type of individuality consists in the intensification of nervous stimulation which results from the swift and uninterrupted change of outer and inner stimuli.

Cities are, first of all, seats of the highest economic division of labor.