"The word "discretion" has been frequently used. . . . What does it mean? In honest, plain language it means "do as you like." A direction which is to be actively exercised must be exercised honestly and intelligently, but the discretion which a man chooses to exercise by remaining supine is a duty, if it is a duty, of imperfect obligation. If no shadow of suspicion can be brought against him, if no culpable negligence can be alleged against him, what liability does a man in whom the discretion is vested incur by doing nothing? Attention should be paid to the meaning of the word, and the effect of it in the various cases in which its operation is called in question."