Cellular pathology is not an end if one cannot see any alteration in the cell. Chemistry brings the clarification of living processes nearer than does anatomy. Each anatomical change must have been preceded by a chemical one.

Imprisoned quacks are always replaced by new ones.

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.

If popular medicine gave the people wisdom as well as knowledge, it would be the best protection for scientific and well-trained physicians.

It is the curse of humanity that it learns to tolerate even the most horrible situations by habituation.

Belief begins where science leaves off and ends where science begins.

My politics were those of prophylaxis, my opponents preferred those of palliation.