We live in a time of transition, an uneasy era which is likely to endure for the rest of this century. During the period we may be tempted to abandon some of the time-honored principles and commitments which have been proven during the difficult times of past generations. We must never yield to this temptation. Our American values are not luxuries, but necessities - not the salt in our bread, but the bread itself.
in his farewell address.