Thomas Aquinas,
Summa Theologiae — Question 184 - OF THE STATE FO PERFECTION IN GENERAL…
“ As the conditions of the present life do not allow of a man always tending actually to God, so neither does it allow of his tending actually to each individual neighbor; but it suffices for him to tend to all in common and collectively, and to each individual habitually and according to the preparedness of his mind. Now in the love of our neighbor, as in the love of God we may observe a twofold perfection: one without which charity is impossible, and consisting in one's having in one's affections nothing that is contrary to the love of one's neighbor ”
