The secret of life is to be found in life itself, in the full organic, intellectual and spiritual activities of our body.

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

Intuition comes very close to clairvoyance; it appears to be the extrasensory perception of reality.

The best way of increasing the [average] intelligence of scientists would be to reduce their number.

Only in prayer do we achieve that complete and harmonious assembly of body, mind, and spirit which gives the frail human reed its unshakable strength.

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.

To what extent is any given man morally responsible for any given act? We do not know