Praising the Lord is not some kind of casual meaningless activity. There is power in praise.1

Psalm 150:1-6 shares the reasons and ways to praise God. It is the last psalm in the entire book and it ends this book on the right note (no pun intended). If the Book of Psalms is about worship, then Psalm 150 reveals to us that in the end of time, we will be praising God.
Psalm 150 ends the Psalter with a call to praise. The word praise is repeated thirteen times in six verses. This psalm is a little introduction to and summary of what real worship is: expressing joyful de light in the presence of God.2

This psalm gives us five reasons to praise God.

FIVE REASONS TO PRAISE GOD

1. Praise God because of Who He is (Psalm 150:1).

“Hallelujah! Praise God in His sanctuary. Praise Him in His mighty heavens.” (Psalm 150:1, HCSB)

This is the who of praise.

The psalm challenges the worshipper to praise God in the sanctuary. The sanctuary is a place of worship and holiness. God is holy because He is unique and because of Who He is, we spend time worshiping Him. The purpose of worshiping Him in the sanctuary is to declare that God is worth our worship. God is God and we are called to worship Him because He is Who He is. Man is not meant to be worshiped, but God is because He is unique above us.