As long as vitalism and spiritualism are open questions so long will the gateway of science be open to mysticism.

Imprisoned quacks are always replaced by new ones.

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

Medical statistics will be our standard of measurement: we will weigh life for life and see where the dead lie thicker, among the workers or among the privileged.

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.

Marriages are not normally made to avoid having children.

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