Ephesians 3:17 That Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love,

Christ only dwells in our hearts through faith (John 14:18, John 14:20, John 14:21). Faith, without works is dead, or rather worthless. A persons is not saved by merely understanding, or being persuaded, that Jesus is the Christ. As Jesus sets forth in John 14, a person must love Him and must keep His commandments. If a person looses faith, turns back to the world, our returns to disobedience, Christ will not continue to dwell in such filth.