Joy is being fully aware of reality.

He who has not God in himself cannot feel His absence.

I am not a Catholic; but I consider the Christian idea, which has its roots in Greek thought and in the course of the centuries has nourished all of our European civilization, as something that one cannot renounce without becoming degraded.

True definition of science: the study of the beauty of the world.

A doctrine serves no purpose in itself, but it is indispensable to have one if only to avoid being deceived by false doctrines.

Intellectual adherence is never owed to anything whatsoever, for it is never in any degree a voluntary thing. Attention alone is voluntary. It alone forms the subject of an obligation.

Armies under the control of ... a sovereign State cannot bring freedom to anyone.