When you're thinking about something that you don't understand, you have a terrible, uncomfortable feeling called confusion... Now, is the confusion's because we're all some kind of apes that are kind of stupid working against this, trying to figure out [how] to put the two sticks together to reach the banana and we can't quite make it... So I always feel stupid. Once in a while, though, the sticks go together on me and I reach the banana.

Observation, reason, and experiment make up what we call the scientific method.

We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt.

To not know math is a severe limitation to understanding the world.

Work as hard and as much as you want to on the things you like to do the best.

There is no harm in doubt and skepticism, for it is through these that new discoveries are made.

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