From The 12 Steps to Holiness by St. Alphonsus Liguori
To correct emphatically is one thing; to reprove harshly is another.
But we must guard against using a angry tone which betrays an absence of self-control; this often does more harm than good.
Let meekness and gentleness predominate.
Meekness accomplishes far more than anger and bitterness.
You must endeavor to be mild and amiable to everyone, under all circumstances and at all times.
If we must answer one who offends us, let us do so with meekness. A mild answer breaketh wrath, says Holy Scripture.(Prov. 15:1)