1 John 3:9 Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God.
When we accept Christ into our lives and into our hearts we cannot help but to be changed by this. We are not re-created as a perfect being as some may read this verse, but rather that the lust for sin should be left behind.
As worldly people we invite sin into our lives and play along with it as if it is a toy. But when we really invite Christ into our lives we turn our hearts against this temptation and vow to turn from sin.
It is this willingness to turn from sin that should drive our lives from that moment on; a willingness to follow Christ.