Let A be a success in life. Then A = x + y + z, where x = work, y = have fun, z = shut up.
Knowledge is acquired through experience, everything else is just information.
Place your hand on a stove for a minute and it seems like an hour. Sit with a pretty girl an hour and it seems to last a minute. That's the relativity.
I do not know how will be the third world war, but I know that there will not be many people to see the fourth.
Two things are infinite: the Universe and human stupidity. But as far as the Universe is concerned, I have not yet acquired absolute certainty.