God is fire which warms and inflames the heart and womb. And so, if we feel in our hearts coldness, which is from the devil, for he is cold, then let us pray to the Lord for he came to warm our hearts with perfect love, not only of him but of our neighbor too. And in the face of his warmth the cold of the hater-of-good will flee away.
St. Seraphim of Sarov, “The Exhortation of Our God-Bearing Father St. Seraphim of Sarov the Miracle Worker,” The Journal of the Moscow Patriarchate 8 . p 40.