Belief has no place as far as science reaches, and may be first permitted to take root where science stops.

Imprisoned quacks are always replaced by new ones.

Medicine is a social science, and politics is nothing more than medicine on a grand scale.

Life itself is but the expression of a sum of phenomena, each of which follows the ordinary physical and chemical laws.

The task of science, therefore, is not to attack the objects of faith, but to establish the limits beyond which knowledge cannot go and found a unified self-consciousness within these limits.

It is the curse of humanity that it learns to tolerate even the most horrible situations by habituation, that it forgets the most shameful happenings in the daily shame of events, and that it can hardly understand when individuals aim to destroy this infamy.

Disease is not something personal and special, but only a manifestation of life under modified conditions, operating according to the same laws as apply to the living body at all times, from the first moment until death.