Praise thyself never.
Associate with people who are likely to improve you.
Crime oft recoils upon the author's head.
He who begs timidly courts a refusal.
A single lifetime, even though entirely devoted to the sky, would not be enough for the study of so vast a subject. A time will come when our descendants will be amazed that we did not know things that are so plain to them.
The Fates guide those who go willingly. Those who do not, they drag.