Life is... 

"All man dies, but only some live." Life is, how you make it a life.

"A sphere is something that is VERY round." -- author unknown

"It is better to keep your mouth shut and be thought a fool, than open your mouth and remove all doubt." -- author unknown

"For every minute you are angry, you lose 60 seconds of happiness." -- author unknown

"If I have seen further than you, it is by standing upon the shoulders of giants."

"I do not know what I may seem to the world. But as to myself I seemed to have been only like a boy playing on the seashore and diverting myself in now and then finding a smoother pebble or prettier shell than ordinary, while the great ocean of truth lay all undiscovered before me."

--- Sir Issac Newton

"Things should be made as simple as possible, but not any simpler."
--Albert Einstein

If you don't understand it, then you'll probably live a happy life anyway.