All the facts of nature are nouns of the intellect, and make the grammar of the eternal language. Every word has a double, trebleor centuple use and meaning.
The conservation of our natural resources and their proper use constitute the fundamental problem which underlies almost every other problem of our national life.
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.