Criticism engenders resentment
Criticism is futile because it puts a person on the defensive and usually makes him strive to justify himself. Criticism is dangerous, because it wounds a person's precious pride, hurts his sense of importance, and arouses resentment.
B. F Skinner, the world-famous psychologist, proved through his experiments that an animal rewarded for good behavior will learn much more rapidly and retain what it learns for more effectively than an animal punished for bad behavior. Later studies have shown that the same applies to humans. By criticizing, we do not make lasting changes and often incur resentment.
We do not love people so much for the good they have done us, as for the good we do them.
Love does not consist of gazing at each other, but in looking outward together in the same direction.
It is not a lack of love, but a lack of friendship that makes unhappy marriages.