There is no such thing as constructive criticism.
Criticisms are like homing pigeons. They always return home.
People like people who help them like themselves.
Let's fight for our happiness by following a daily program of cheerful and constructive thinking.
Criticism of others is futile and if you indulge in it often you should be warned that it can be fatal to your career.
Our fatigue is often caused not by work, but by worry, frustration and resentment.