Doubt is clearly a value in science. It is important to doubt and that the doubt is not a fearful thing, but a thing of great value.

But there is nothing in biology yet found that indicates the inevitability of death.

The test of all knowledge is experiment.

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.

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.

We are not to tell nature what she’s gotta be... She's always got better imagination than we have.