‘Learn of me,’ Jesus said, ‘for I am meek and humble of heart.’ Humility perfects us towards God, mildness and gentleness towards our neighbour.
But be careful that mildness and humility are in your heart, for one of the great wiles of the enemy is to lead people to be content with external signs of these virtues, and to think that because their words and looks are gentle, therefore they themselves are humble and mild, whereas in fact they are otherwise. In spite of their show of gentleness and humility, they start up in wounded pride at the least insult or annoying word.
Present life is the road to a blessed life, so do not let us be angry with one another on the way. Never give way to anger if you can possibly avoid it; never for any reason let it enter your heart. It is safer to avoid all anger than to try and guide our anger with discretion and modesty. Directly you feel the slightest resentment, gather your powers together gently. When we are agitated by passion, we must imitate the apostles in the raging storm and call upon God to help us. He will bid our anger be still, and great will be our peace.
One form of gentleness we should practise is towards ourselves. We should never get irritable with ourselves because of our imperfections. It is reasonable to be displeased and sorry when we commit faults, but not fretful or spiteful to ourselves. Some make the the mistake of being angry because they have been angry, hurt because they have been hurt, vexed because they have been vexed. They think they are getting rid of anger, that the second remedies the first; actually, they are preparing the way for fresh anger on the first occasion. Besides this, all irritation with ourselves tends to foster pride and springs from self-love, which is displeased at finding we are not perfect.We should regard our faults with calm, collected, and firm displeasure. We correct ourselves better by a quiet persevering repentance than by an irritated, hasty, and passionate one. When your heart has fallen raise it gently, humbly yourself before God, acknowledging your fault, but not surprised at your fall. Infirmity is infirm, weakness weak, and frailty frail.
Introduction to the Devout Life III:8-9