As he acquires knowledge, choose what ideas he shall attach to it; as his passions awake, select scenes calculated to repress them. A veteran, as distinguished for his character as for his courage, once told me that in early youth his father, a sensible man but extremely pious, observed that through his growing sensibility he was attracted by women, and spared no pains to restrain him; but at last when, in spite of all his care, his son was about to escape from his control, he decided to take him to a hospital, and, without telling him what to expect, he introduced him into a room where a number of wretched creatures were expiating, under a terrible treatment, the vices which had brought them into this plight. This hideous and revolting spectacle sickened the young man. "Miserable libertine," said his father vehemently, "begone; follow your vile tastes; you will soon be only too glad to be admitted to this ward, and a victim to the most shameful sufferings, you will compel your father to thank God when you are dead." These few words, together with the striking spectacle he beheld, made an impression on the young man which could never be effaced. Compelled by his profession to pass his youth in garrison, he preferred to face all the jests of his comrades rather than to share their evil ways. "I have been a man," he said to me, "I have had my weaknesses, but even to the present day the sight of a harlot inspires me with horror." Say little to your pupil, but choose time, place, and people; then rely on concrete examples for your teaching, and be sure it will take effect.