We can't have a decent government unless those in power exercise self restraint.
The President can exercise no power which cannot be fairly and reasonably traced to some specific grant of power in the Federal Constitution or in an act of Congress passed in pursuance thereof. There is no undefined residuum of power which he can exercise because it seems to him to be in the public interest.
That all may be so, but when I begin to exercise that power I am not conscious of the power, but only of the limitations imposed on me.