It is a good practice of humility, to consider the actions of others only to remark the virtues and never the imperfections; for when we have no charge over them, we must not turn our eyes, still less our attention, that way. We must always interpret in the best sense we can what we see our neighbour do; and in doubtful things we must persuade ourselves that what we have perceived is not evil, but that it is our imperfection that causes such thoughts; in order to avoid rash judgments on the actions of others, which is a very dangerous evil, and to be detested above all others. In things evidently bad, we must have compassion, and humble ourselves for our neighbour's faults, as if they were our own, and pray God for their amendment with the same earnestness that we should for our own, if we were subject to the same defects.

-St. Francis de Sales, The True Spiritual Conferences of St. Francis of Sales