A few observation and much reasoning lead to error; many observations and a little reasoning to truth.

Men grow when inspired by a high purpose, when contemplating vast horizons. The sacrifice of oneself is not very difficult for one burning with the passion for a great adventure.

Intelligence is almost useless to the person whose only quality it is.

As to virtue . . . it is an act of the will, a habit which increases the quantity, intensity and quality of life. It builds up, strengthens and vivifies personality.

A few observation and much reasoning lead to error; many observations and a little reasoning to truth.

Comforts and syphilis are the greatest enemies of mankind.

The cell is immortal. It is merely the fluid in which it floats that degenerates. Renew this fluid at regular intervals, give the cells what they require for nutrition, and as far as we know, the pulsation of life can go on forever.