As his body became more and more defenseless, so his means of offense became steadily more frightful.
Guns are the crutches of the impotent.
Astronomy, as nothing else can do, teaches men humility.
It is vital to remember that information - in the sense of raw data - is not knowledge, that knowledge is not wisdom, and that wisdom is not foresight. But information is the first essential step to all of these.
The future is not to be forecast, but created.
If an elderly but distinguished scientist says that something is possible, he is almost certainly right; but if he says that it is impossible, he is very probably wrong.