Long only for what you have.

Most often it happens that one attributes to others only the feelings of which one is capable oneself.

Atheism. There is not a single exalting and emancipating influence that does not in turn become inhibitory.

I can't expect others to share my virtues. It's good enough for me if they share my vices.

No theory is good unless it permits, not rest, but the greatest work. No theory is good except on condition that one use it to go on beyond.

Through loyalty to the past, our mind refuses to realize that tomorrow's joy is possible only if today's makes way for it; that each wave owes the beauty of its line only to the withdrawal of the preceding one.

Too chaste an adolescence makes for a dissolute old age. It is doubtless easier to give up something one has known than something one imagines.