"What is a merciful heart? It is a heart on fire for the whole of creation, for humanity, for the birds, for the animals, for demons, and for all that exists. By the recollection of them, the eyes of a merciful person pour forth tears in abundance...by such great compassion, the heart is humbled, and one cannot bear to hear or to see any injury or slight sorrow in any in creation. For this reason, such a person offers up tearful prayer continually even for irrational beasts, for the enemies of the truth, and for those who harm him, that they be protected and receive mercy."
-St. Isaac the Syrian