Another batch of my favorite quotes:
"Teachers open the door, but you must enter by yourself." - Chinese proverb
"More die in the United States of too much food than of too little." - John Kenneth Galbraith
"Tact is the art of making a point without making an enemy." - Sir Isaac Newton
"It is a real puzzle for the science of mind why, when an unpleasant event befalls us - we slice our thumb along with the bagel, or knock a glass of bear into our lap - the topic of our conversation turns abruptly to sexuality, excretion, or religion." - Steven Pinker
"The business of skepticism is to be dangerous. Skepticism challenges established institutions. If we teach everybody, including, say, high school students, habits of skeptical thought, they will probably not restrict their skepticism to UFOs, aspirin commercials, and 35,000-year-old channelees. Maybe they'll start asking awkward questions about economic, or social, or political, or religious institutions. Perhaps they'll challenge the opinions of those in power. Then where would we be?" - Carl Sagan