Matthew Henry Commentary Psalms 139:1-6

"O Jehovah, thou hast searched me, and known [me]. Thou knowest my downsitting and mine uprising; Thou understandest my thought afar off. Thou searchest out my path and my lying down, And art acquainted with all my ways. For there is not a word in my tongue, But, lo, O Jehovah, thou knowest it altogether. Thou hast beset me behind and before, And laid thy hand upon me. [Such] knowledge is too wonderful for me; It is high, I cannot attain unto it." — Psalms 139:1-6 (ASV)

God has perfect knowledge of us, and all our thoughts and actions are open before Him. It is more profitable to meditate on Divine truths, applying them to our own cases, and with hearts lifted to God in prayer, than with a curious or argumentative mindset. That God knows all things (He is omniscient), and that He is everywhere (He is omnipresent), are truths acknowledged by all; yet they are seldom genuinely believed by humanity.

God takes strict notice of every step we take—every right step and every misstep. He knows what rule we walk by, what purpose we walk toward, and what company we walk with. When I am withdrawn from all company, You know what I have in my heart.

There is not a vain word, nor a good word, but You know from what thought it came and with what intention it was uttered. Wherever we are, we are under the eye and hand of God. We cannot by searching discover how God searches us out, nor do we know how we are known.

Such thoughts should restrain us from sin.