How comfortable are you in hating other professing Christians? Do you hold grudges? Do you purposefully avoid speaking to believers whom you dislike? Do you recount all the wrongs someone has done to you even after they have apologized? Ask the Lord to help you search your heart and to make you distressed when you hate another Christian. If you presently hate someone, perform an act of love for that person today as you ask God to change your heart.
Biologically speaking, Cain and Abel were from the same family. However, they did not share the same spiritual heritage. Though we might think they were brothers, in an ultimate and eternal sense they were not. The church can also be viewed this way. We might belong to a corporate body, a manifestation of the visible church, but if we hate others in it, we are not children of God and not a part of the invisible church. Tell a fellow Christian that you love him today.