1 O LORD, you have searched me
and you know me.
2 You know when I sit and when I rise;
you perceive my thoughts from afar.
3 You discern my going out and my lying down;
you are familiar with all my ways.
4 Before a word is on my tongue
you know it completely, O LORD.
5 You hem me in—behind and before;
you have laid your hand upon me.
6 Such knowledge is too wonderful for me,
too lofty for me to attain.
7 Where can I go from your Spirit?
Where can I flee from your presence?
8 If I go up to the heavens, you are there;
if I make my bed in the depths, you are there.
9 If I rise on the wings of the dawn,
if I settle on the far side of the sea,
10 even there your hand will guide me,
your right hand will hold me fast.
David knew that only God could see in our hearts where ever we are and only he understand us better we can understand ourselves – even before we are born (see 139:13, 14) :)