“Discipline is choosing between what you want now, and what you want most.” —Abraham Lincoln I learned a valuable lesson from my son. From the time he was in the womb, according to my ultrasounds, my son loved to suck his thumb. After he was born, we tried to get him to use a pacifier, but out came the pacifier, and in went his thumb. His thumb, combined with his silk blanket, became his source of comfort, and his means of lulling himself to sleep. His thumb seemed to be in his mouth more than it was out. When the time for kindergarten came, and he showed no signs of giving up his thumb habit, I came up with the idea of showing him photos of people with misaligned teeth from the sucking. After explaining that this could happen to him, he reluctantly agreed that when he lost his first …