Since periods of great change, such as the present one, come so rarely in human history, it is up to each of us to make the best use of our time to help create a happier world.
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.
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.
We must break problems down into small, digestible bits. We must define the concepts that we use and explain what components they consist of. We must tackle small problems.
The sciences, even the best,-mathematics and astronomy,-are like sportsmen, who seize whatever prey offers, even without being able to make any use of it.