criticism is dangerous, because it wounds a person's precious pride, hurt his sense of importace and arouse resentment.
Dale CarnegieA smile is nature's best antidote for discouragement. It brings rest to the weary, sunshine to those who are frowning, and hope to those who are hopeless and defeated. A smile is so valuable that it can't be bought, begged, borrowed, or taken away against your will. You have to be willing to give a smile away before it can do anyone else any good. So if someone is too tired or grumpy to flash you a smile, let him have one of yours anyway. Nobody needs a smile as much as the person who has none to give.
Dale CarnegieWhen we hate our enemies, we are giving them power over us: power over our sleep, our appetites, our blood pressure, our health and our happiness. Our enemies would dance with joy if only they knew how they were worrying us, lacerating us, and getting even with us! Our hate is not hurting them at al, but our hate is turning our days and nights into a hellish turmoil.
Dale Carnegie