"If a man finds it very hard to forgive injuries, let him look at a Crucifix, and think that Christ shed all His Blood for him, and not only forgave His enemies, but even prayed His Heavenly Father to forgive them also. Let him remember that when he says the Pater Noster, every day, instead of asking pardon for his sins, he is calling down vengeance on himself."
During mental prayer, it is well, at times, to imagine that many insults and injuries are being heaped upon us, that misfortunes have befallen us, and then strive to train our heart to bear and forgive these things patiently, in imitation of our Saviour. This is the way to acquire a strong spirit.
They who have been exercised in the service of God for a long time, may in their prayers imagine all sorts of insults offered to them, such as blows, wounds, and the like, and so in order to imitate Christ by their charity, may accustom their hearts beforehand to forgive real injuries when they come.
