1 Timothy 1:5; 1 Peter 1:22-23

The aim of our charge is love that issues from a pure heart and a good conscience and a sincere faith.

Having purified your souls by your obedience to the truth for a sincere brotherly love, love one another earnestly from a pure heart, since you have been born again, not of perishable seed but of imperishable, through the living and abiding word of God; (ESV)