This brief century of ours is arguably the most significant one in the history of our universe. We'll have the technology either to self-destruct, or [to] seed our cosmos with life. The situation is so unstable that I doubt we can dwell at this fork in the road for more than another hundred years. But if we end up going the life route instead of the death route, then in a distant future our cosmos will be teaming with life, all of which can be traced back to what we do-here and now. I don't know how we'll be thought of, but I'm sure that we won't be remembered as insignificant.

There’s no better guarantee of failure than convincing yourself that success is impossible, and therefore never even trying.

If life were a movie, physical reality would be the entire DVD: Future and past frames exist just as much as the present one.

In 2056, I think you'll be able to buy T-shirts on which are printed equations describing the unified laws of our universe.

In infinite space, even the most unlikely events must take place somewhere.

This brief century of ours is arguably the most significant one in the history of our universe. We'll have the technology either to self-destruct, or [to] seed our cosmos with life. The situation is so unstable that I doubt we can dwell at this fork in the road for more than another hundred years. But if we end up going the life route instead of the death route, then in a distant future our cosmos will be teaming with life, all of which can be traced back to what we do-here and now. I don't know how we'll be thought of, but I'm sure that we won't be remembered as insignificant.

For me, [John Wheeler] was the last Titan, the only physics superhero still standing.