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.
St. Francis of Assisi taught me that there is a wound in the Creation and that the greatest use we could make of our lives was to ask to be made a healer of it.
The conservation of our natural resources and their proper use constitute the fundamental problem which underlies almost every other problem of our national life.