When the Lord calls us to faith, what happens to our heart? He begins to change it. Our lives reflect what is in our heart. When we allow Christ to mold us, we become more like Him. This process isn't comfortable or easy, but it is well worth it. God changes our heart through His grace which gives us strength to follow Him. It's not a one time event but a daily renewing of our minds. Jesus is constantly pleading our cause so we need to do our part to repent and allow ourselves to be transformed.