"For a man's ways are before the eyes of the LORD,
And He ponders (watches, weighs) all his paths."  Proverbs 5:21  
(Margin notes)

As 'children of the light' it is wonderful to know that we are never out of God's sight.  He knows where we are at all times.  He knows what is happening with and to us at all times.  It is, however, very sobering as well.  No transgression is hidden from Him and for this we are thankful and we rejoice!  For He has given us His Holy Spirit who leads us into all truth and He exposes to our hearts the error of our way.

The Apostle John tells believers,
"If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth.  But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.  1 John 1:6-7

John goes on to say,
"If we say that we have no sin, we deceive ourselves, and the truth is not in us."
Then here is God's wonderful provision:
"If we confess our sins, He is faithful and just to to forgive us our sins and cleanse us from all unrighteousness."  1 John 18-9

"The eyes of the LORD are toward the righteous and His ears toward their cry."  Psalm 34:15

Take note of Psalm 34:16,
"The face of the LORD is against evildoers,
To cut off the memory of them from the earth."

"For the LORD knows the way of the righteous,
But the way of the ungodly shall perish."  Psalm 1:6

"...For the LORD searches every heart and understands every motive behind the thoughts. If you seek Him, He will be found by you..."  1 Chronicles 28;:9

:"For the eyes of the LORD run to and fro throughout the whole earth, to show Himself strong on behalf of those whose heart is loyal to Him..."  2 Chronicles 16.9 

Read Psalm 139 again to see how intimately God knows each one!

"For you were formerly darkness, but now you are light in the Lord ; walk as children of light."  Ephesians 5:8

There are many verses in Scripture that could be included here concerning God's watchful eye on both the children of light and those of darkness, but I leave that to your own personal study.

"Let us therefore come boldly to the throne of grace, that we may obtain mercy and find grace to help in time of need."  Hebrew 4:16          Amen