When our grandson Jay was a child his parents gave him a new T-shirt for his birthday. He put it on right away and proudly wore it all day. When he appeared the next morning in the shirt, his dad asked him, “Jay, does that shirt make you happy?” “Not as much as yesterday,” Jay replied. That’s the problem with material acquisition: Even the good things of life can’t give us the deep, lasting happiness we so strongly desire. Though we may have many possessions, we may still be unhappy...