The Greek conception of a life in harmony with nature found its most complete development in the rationalism of the Renaissance and of the centuries that followed it.

It is, of course, quite natural that a biologist whose attention had been aroused by noticing in his own case the phenomena of precocious old age should turn to study the causes of it.

Most of the centenarians whom I have been able to see have been so defective mentally that all that can be studied in them are the physical qualities and functions.

Elie Metchnikoff Quotes