From the Fathers

We faithful ought to look upon all the faithful as one single being. We should consider that Christ is in each one. We should therefore be ready to give our life willingly for the sake of our love for Him. We have no right at all to say, or even to think, that a person is evil. As I have said, we should consider all of them good, and even if you see someone swept away by the passions, do not hate your brother, [hate instead] the passions which torment him.

St. Symeon the New Theologian, The Practical and Theological Chapters.