Begin with praise and honest appreciation. Call attention to people's mistakes indirectly. Talk about your own mistakes before criticizing the other person. Ask questions instead of giving direct orders. Make the fault easy to correct. Make the other person happy about doing what you suggest.
Dale CarnegieMillions of people have wrecked their lives in angry turmoil, because they refused to accept the worst; refused to try to improve upon it; refused to salvage what they could from the wreck. Instead of trying to reconstruct their fortunes, they engaged in a bitter and "violent contest with experience"- and ended up victims of that brooding fixation known as melancholia.
Dale CarnegieWhen ill luck besets us, to ease the tension we have only to remember that happiness is relative. The next time you are tempted to grumble about what has happened to you, why not pause and be glad that it is no worse than it is.
Dale Carnegie