"For this reason, they are before the THRONE of GOD;

and they serve HIM day and night in HIS temple; and

`Day and night' means continually like the four living creatures do in Revelation 4:8 . That there is day and night at this time of John's vision indicates that the first heaven (Genesis 1:6-8) and the first earth have not passed away yet, Revelation 21:1 . Symbolicly, this matches with Christ's prayer that we are in Him and He in us, John 17:20-26 , and His teaching that as a vine we abide in unity, John 15:1-8 . Then we, as believers, being His temple right now, 1 Corinthians 3:16-17 , also should have this same singleness of purpose:

The result of SERVING GOD:

1. Protection - this verse
2. - next verse
3. Guidance - verse 17
4. Comfort - verse 17

He who sits on THE THRONE shall spread his tabernacle over them.

This is so typical GOD - He did the same with His shekinah presence on the Old Testament:

• Exodus 40:34-38 - The people journied with God's protective cloud.
• 1 Kings 8:5-13 - The ark is brought into the new temple Solomon build. The cloud of God, the glory of God, is overpowering.
• Ezekiel 10:1-4-5, 18-19 - Vision of heavenly THRONE with cherubim (4 living creatures) and the glory of God cloud again.

Later on Jesus himself defined the TRUE LIGHT in John 1:9-14 . And we get to partake of it! AMEN.