The heaven of the envied is hell for the envious. [...because they focus on what they don't have rather than being grateful for what they have, which is always better than some others.]

One must pass through the circumference of time before arriving at the center of opportunity.

It is better to sleep on things beforehand than lie awake about them afterwards.

Attempt easy tasks as if they were difficult, and difficult as if they were easy; in the one case that confidence may not fall asleep, in the other that it may not be dismayed.

Don't show off every day, or you'll stop surprising people. There must always be some novelty left over. The person who displays a little more of it each day keeps up expectations, and no one ever discovers the limits of his talent.

Keep to yourself the final touches of your art.

He that communicates his secret to another makes himself that other's slave.