The rockets... can be built so powerfully that they could be capable of carrying a man aloft.

This is the goal: To make available for life every place where life is possible. To make inhabitable all worlds as yet uninhabitable, and all life purposeful.

We cannot take credit for our record avancement in certain scientific fields alone. We have been helped, and we have been helped by the people of other worlds.

Our educational system is like an automobile which has strong rear lights, brightly illuminating the past. But looking forward things are barely discernible.

If there is a small rocket on top of a big one, and if the big one is jettisoned and the small one is ignited, then their speeds are added.

In the United States, I am often addressed as a doctor. I should like to point out, however, that I am not such and shall never think of becoming one.

One becomes bad himself when he sees or calls others bad. When others appear good to him, he will become good himself.

Her voice, unfolding like a tiny bright memory in the darkest, furthest corner of my mind.

Where there is great love, there are always wishes.

Every realm of nature is marvelous.

In part, slacktivism is what happens when the energy of otherwise dedicated activists is wasted on approaches that are less effective than the alternatives.

There are never victories in conservation. If you want to save a species or a habitat, it's a fight forevermore. You can never turn your back.

I think every year, my role changes. And I am an open house for advice, for anyone to use. It's just a matter of asking questions.

I said, in talking, that I felt more and more the time wasted that was not spent in Ireland.

Here's the thing with lyrics: Words are just another musical instrument.

Poor people either mismanage their money or they avoid the subject of money altogether.