You will not find your passion in things and you will not find your passion in money. The more things and the more money you have, the more you will look around and use that as the metric and there will be someone with more.

You can always change you plan, but only if you have one.

If you have a question, then find the answer.

I understand the arguments about how the billions of dollars spent to put men on the moon could have been used to fight poverty and hunger on Earth. But, look, I'm a scientist who sees inspiration as the ultimate tool for doing good. When you use money to fight poverty, it can be of great value, but too often, you're working at the margins. When you're putting people on the moon, you're inspiring all of us to achieve the maximum of human potential, which is how our greatest problems will eventually be solved. Give yourself permission to dream.

Don’t complain; just work harder.

He had high hopes for society, and though his hopes were too often dashed, he remained a raging optimist.

Time is all you have and you may find one day that you have less than you think.