The greatest misery does not stop Me from uniting Myself to a soul, but where there is pride, I am not there.
Our Lord's message to St. Faustina - Diary (1563)
Humility is the only thing that no devil can imitate.
St John Climacus
Virtues are formed by prayer. Prayer preserves temperance. Prayer suppresses anger. Prayer prevents emotions of pride and envy. Prayer draws into the soul the Holy Spirit, and raises man to Heaven.
Saint Ephraem of Syria
Envy, my children, follows pride; whoever is envious is proud. See, envy comes to us from Hell; the devils having sinned through pride, sinned also through envy, envying our glory, our happiness. Why do we envy the happiness and the goods of others? Because we are proud; we should like to be the sole possessors of talents, riches, of the esteem and love of all the world! We hate our equals, because they are our equals; our inferiors, from the fear that they may equal us; our superiors, because they are above us.
Saint John Vianney
"God is stern in dealing with the arrogant, but to the humble He shows kindness." - Proverbs 3:34
I've heard of several things that are the "only" things the devil supposedly can't do or imitate.