Squaring one’s conscience

Look at this square for a few seconds and then blow on. If it turns green, call the doctor. If it turns brown, see your dentist quickly. If it turns purple, make sure to see your psychiatrist. If it turns red, see your banker as soon as you can. If it turns black, call your lawyer and make a will. If it remains the same color, white, you are in good health, and there is no reason on earth why you should not be in church next Sunday morning, and every Sunday thereafter.