One could dare say that a man’s friends do more harm to his soul than his enemies. The Lord Himself said, ‘A man’s foes, shall be they of his own household’ (Matthew 10:36; Micah 7:6). Those who live under the same roof with us, and who are so concerned for our bodily needs and comfort, are often the worst enemies of our salvation, for their love and concern are not aimed at our soul but our body. How many parents have done inestimable damage to the souls of their sons [daughters], and brothers and sisters to the souls of their siblings, and wives to the souls of their husbands [and vice versa]? And this all out of love for them! This realisation, that is confirmed every day, is a further solid reason for us not to give ourselves over too completely to love of our kinsfolk and friends, nor to lesson our love of our enemies. Is it necessary to say once again, that often, very often, our enemies are our true friends? The ways in which they unsettle us are of help to us; the ways in which they denounce us serve for our salvation; the ways in which they press on our outward, physical life help us to withdraw inwards, into ourselves, and find our souls cry to the living God to save them. In very truth, our enemies are often those who save us from the ruin that our kinsfolk prepare, inadvertently making our characters lax and feeding up our bodies at the cost of our souls.
St. Nikolai Velimirovic, Homilies Vol 2, 19th Sunday After Pentecost, p. 196