When malice against anyone is roused in your heart, then believe with your whole heart that it is the work of the Devil working in your heart: hate him and his brood, and malice will leave you. (Do not acknowledge it as anything of your own, and do not sympathise with it.) This is from experience. Unfortunately, the Devil shelters himself behind us, and conceals himself, whilst we are blind, and, thinking we are doing everything of ourselves, begin to stand up for the Devil's works as if they were our own, as if for something just, although every idea of there being any justice in our passion is entirely false, impious, and hurtful. Guide yourself by the same rule also in regard to others. When you see that anybody bears malice against you, do not consider his malice as his own doing; no, he is only the passive instrument of the evil one; he has not yet recognised his flattery and is deceived by him. Pray to God that the enemy may leave him and that the Lord may enlighten the eyes of his heart, darkened by the poisonous, noxious breathing of the spirit of evil. We must pray fervently for all those subjected to passions, for the enemy works within them.
Saint John of Kronstadt
My Life in Christ can be read in its entirety for free here, incidentally. I'll start posting less edifying things soon, no worries.