I think that in today's world, by nature, we are all self-centered. And that often leads to selfishness.

To be happy, we must be true to nature and carry our age along with us.

Gossip is nature's telephone.

Man is the unnatural animal, the rebel child of nature, and more and more does he turn himself against the harsh and fitful hand that reared him.

By nature's kindly disposition most questions which it is beyond a man's power to answer do not occur to him at all.