Public enemy #1 is our consicence. This may be the reason we cannot serve God out of a pure heart, then that influences our relationships as well.
We attempt to placate our consciences, but God has satisfied the demands of His “conscience”, so His mind does not consider our sin. The Gospel is the greatest in all. (1Pt 2:19-20, Psa 103:12, Heb 9:14, 10.)