Words are acoustical signs for concepts; concepts, however, are more or less definite image signs for often recurring and associated sensations, for groups of sensations. To understand one another, it is not enough that one use the same words; one also has to use the same words for the same species of inner experiences; in the end one has to have one's experiences in common.
Today it is even more important to dominate the . . . highly sophisticated weapon systems, perhaps even more important than being a good pilot; to make the best use of this system.
We will be better and braver if we engage and inquire than if we indulge in
the idle fancy that we already know -- or that it is of no use seeking to
know what we do not know.
And tell him it's quite true that the best of the philosophers are of no use to their fellows; but that he should blame, not the philosophers, but those who fail to make use of them.
To become indignant at [people's] conduct is as foolish as to be angry with a stone because it rolls into your path. And with many people the wisest thing you can do, is to resolve to make use of those whom you cannot alter.