If you are a Christian and you love the Lord do you ever feel like searching your heart?
I am going to paraphrase Psalm 139 NIV, please read it in its entirety.
O Lord, you have searched me and you know me. You know when I sit and when I rise; you perceive my thoughts from afar. You discern my going out and my lying down; you are familiar with all my ways. Before a word is on my tongue you know it completely, O Lord.
You hem me in, behind and before you have laid your hand upon me such knowledge is too lofty for me to attain.