A mind troubled by doubt cannot focus on the course to victory.
Never be a cynic, even a gentle one. Never help out a sneer, even at the devil.
Don't be afraid to take a big step if one is indicated. You can't cross a chasm in two small jumps.
Misquotations are the only quotations that are never misquoted.
Science is nothing but developed perception, interpreted intent, common sense rounded out and minutely articulated.
If you think taking care of yourself is selfish, change your mind. If you don't, you're simply ducking your responsibilities.
Facts are stubborn things; and whatever may be our wishes, our inclinations, or the dictates of our passion, they cannot alter the state of facts and evidence.