Knowledge is never too dear.

There is nothing more dangerous than security.

I call God to witness that as a private person I have done nothing unbeseeming an honest man, nor, as I bear the place of a public man, have I done anything unworthy of my place.

There is less danger in fearing too much than too little.

In 1980 candidate Reagan asked whether we were better off than we had been 4 years earlier. In 1992 we will be asked whether we expect our children to live better than we do.

There was the door to which I found no key There was the veil through which 1 might not see.

Sometimes I think we're alone in the universe, and sometimes I think we're not. In either case the idea is quite staggering.

You can assume all photo and video is constructed as a fiction controlled by the person holding the camera and the person who is editing.

No matter what our achievements might be, we think well of ourselves only in rare moments.

I was outraged to learn that the president wanted to outsource operations at some American ports to the United Arab Emirates.

Music and love are the only accomplishments of humanity which do not, in an absolute sense, have to be called attempts with unsuitable means.

Be vigilant, for nothing one achieves lasts forever.

We have the chance to build this new energy economy in ways that reflect our deepest values of inclusion, diversity, and equal opportunity for everyone.

It is profitable wisdom to know when we have done enough: Much time and pains are spared in not flattering ourselves against probabilities.