The theory of our modern technic shows that nothing is as practical as theory.

When we deny the EVIL within ourselves, we dehumanize ourselves, and we deprive ourselves not only of our own destiny but of any possibility of dealing with the EVIL of others.

When all thermonuclear sources of energy are exhausted a sufficiently heavy star will collapse. Unless fission due to rotation, the radiation of mass, or the blowing off of mass by radiation, reduce the star's mass to the order of that of the sun, this contraction will continue indefinitely.

We may anticipate a state of affairs in which two Great Powers will each be in a position to put an end to the civilization and life of the other, though not without risking its own. We may be likened to two scorpions in a bottle, each capable of killing the other, but only at the risk of his own life.

The greatest of the changes that science has brought is the acuity of change; the greatest novelty the extent of novelty.

The physicists have known sin; and this is a knowledge which they cannot lose.

We know that the wages of secrecy are corruption. We know that in secrecy error, undetected, will flourish and subvert.