The parents have not only to train their children: it is of at least equal importance that they should train themselves.

Mankind is becoming a single unit, and that for a unit to fight against itself is suicide.

It is here [in mathematics] that the artist has the fullest scope of his imagination.

The relation of the individual person to the species he belongs to is the most intimate of all relations.

Jealousy, that dragon which slays love under the pretence of keeping it alive.

The more rapidly a civilization progresses, the sooner it dies for another to rise in its place.

Pain and death are part of life. To reject them is to reject life itself.