forgiveness on Praying for your Enemies

I can no longer condemn or hate a brother for whom I pray; no matter how much trouble he causes me. His face, that hitherto may have been strange and intolerable to me, is transformed in intercession ...

Every time your enemy fires a curse, you must fire a blessing, and so you are to bombard back and forth with this kind of artillery. The mother grace of all graces is Christian good-will.