Quotes from the Saints
The Four Hundred Chapters on Love:
149. The one who does not envy or is not angry, or who does not bear grudges against the one who has offended him, does not yet have love for him. For it can be that even one who does not yet love does not return evil for evil because of the commandment but in no way does he render good for evil spontaneously. Indeed, deliberately to do good to those who hate you is a mark of perfect spiritual love alone.
151. When you see your mind dallying with pleasure over material things and taking fond delight in thinking of them, know that you love these things rather than God. "For where your treasure is," says the Lord, "there will you heart be also."
153. Scripture calls material things the world, and worldly people are those who let their mind dwell on them. Against these is the very sharp reproof: "Do not love the world nor the things in the world; the concupiscence of the flesh and the concupiscence of the eyes, and the pride of life are not from God but from the world."
St. Maximus the Confessor