Of course, you only live one life, and you make all your mistakes, and learn what not to do, and that's the end of you.

If you don't like it, go somewhere else, to another universe where the rules are simpler.

Today's brains are yesterday's mashed potatoes.

A scientist is never certain. ... We absolutely must leave room for doubt or there is no progress and there is no learning.

It is important to realize that in physics today, we have no knowledge of what energy is

We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

But logic is not all, one needs one's heart to follow an idea.