His older self had taught his younger self a language which the older self knew because the younger self, after being taught, grew up to be the older self and was, therefore, capable of teaching.

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.

Never try to teach a pig to sing; it wastes your time and it annoys the pig.

I had never been much interested in Pluto, too many facts and too much isolation.

When a place gets crowded enough to require ID's, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.

This is not remarkable, for, as we know, reality is not a function of the event as event, but of the relationship of that event to past, and future, events. We seem here to have a paradox: that the reality of an event, which is not real in itself, arises from the other events which, likewise, in themselves are not real. But this only affirms what we must affirm: that direction is all. And only as we realize this do we live, for our own identity is dependent upon this principal.