There is nothing known as "Perfect". Its only those imperfections which we choose not to see!!

It's not that life has been easy, perfect or exactly as expected. I just choose to be happy and grateful no matter how it all turns out. If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Student: Dr. Einstein, Aren't these the same questions as last year's [physics] final exam? Dr. Einstein: Yes; But this year the answers are different.

Man is, at one and the same time, a solitary being and a social being.

Earnestly I must exert myself in order to return as much as I have received.

Insofar as mathematics is true, it does not describe the real world. Insofar as it describes the real world, it is not true.

If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.