Both the man of science and the man of action live always at the edge of mystery, surrounded by it.

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

In a free world, if it is to remain free, we must maintain, with our lives if need be, but surely by our lives, the opportunity for a man to learn anything

There is something irreversible about acquiring knowledge; and the simulation of the search for it differs in a most profound way from the reality.

To try to be happy is to try to build a machine with no other specification than that it shall run noiselessly.

In the material sciences these are and have been, and are most surely likely to continue to be heroic days.

Both the man of science and the man of action live always at the edge of mystery, surrounded by it.