I know the things that come into your mind, every one of them

This is what the LORD said via Ezekiel (11:5) to the men of Judah who were leading her astray. cf the absence/inadequateness of cctv to control the activities of a mob, each one of us is accountable at a mental level to God. Mere social control? It goes much further than that. As a Christian, I know that ALL my sin is dealt with - even the darkest depths of my memory, will, conscience, affections, - all is covered by the One Sacrifice to end them all... Christ's atoning death on the cross of Calvary.

My sin - oh the bliss of this glorious thought
My sin - not in part, by the whole!
Is nailed to His cross and I bear it no more,
Praise the Lord! Praise the Lord! Oh my soul!

Who is this that engaged his heart to approach unto me?

Jeremiah 30:21 is a searching question from God. Yesterday was Easter Sunday - did you 'engage your heart to approach' him? Or did you continue to harden yourself against even the possibility that you are accountable to him. In the Bourne Supremacy - he tried to find the relatives of the people he'd killed and apologise but it didnt make the horror of guilt go away because basically he's not also seeking forgiveness from the Person he's ultimately sinned against. Christ's act of sacrifice was intended to pay for sins like these so that the burden of them can be taken away and that we might have peace with God.