"You can't go back and change the beginning, but you can start where you are and change the ending."
"Die Kunst ist das Sich-ins-Werk-Setzen der Wahrheit."
Ambition leads me not only farther than any other man has been before me, but as far as I think it possible for man to go.
Black holes are not just cosmic vacuums; they are the ultimate laboratories for testing the limits of our physical theories.
The only person you should try to be better than is the person you were yesterday.