The comfort of God's presence in PSALM NINETEEN

Verse 8b        Psalm 19

ESV  the commandment of the LORD is pure, enlightening the eyes

NIV  The commands of the Lord are radiant, giving light to the eyes

7a, 7b, 8a and 8b each describe a divine action which has an effect
on the believer who comes under each divine influence.
7a   restoring the soul
7b   making the simple wise
8a   making the heart rejoice
8b   enlightening the eyes

As the sun (verse 4,5 and 6) brings light and warmth--from east to west
the word of God brings revelation ( light ) and comfort (the warmth ) of God's Presence.