When we are tired, we are attacked by ideas we conquered long ago.

That little hypocrites and half-crazed people dare to imagine that on their account the laws of nature are constantly broken; such an enhancement of every kind of selfishness to infinity, to impudence, cannot be branded with sufficient contempt. And yet Christianity owes its triumph to this pitiable flattery of personal vanity.

Let your love to life be love to your highest hope; and let your highest hope be the highest thought of life!

Mastery.- We have reached mastery when we neither mistake nor hesitate in the achievement.

When you gaze long into the Abyss of Sustainability, the Abyss of Sustainability also gazes into you.

The most dangerous follower is the one whose defection would destroy the whole party: hence, the best follower.

I listened for the echo, and I heard only praise —