Psalm 9:10-11 And they that know thy name will put their trust in thee: for thou, Lord, hast not forsaken them that seek thee. Sing praises to the Lord, which dwelleth in Zion: declare among the people his doings.
The Lord will judge the enemies (which He did at the Cross) and be a refuge in times of trouble (which He does at the empty Tomb). Because God judged our enemies (sin, death, and the devil) and became a refuge for us, we respond with faith and praise. And, especially since Christ came, we can do the same as David.
Believers know the name of Jesus: it is Yahweh saves. And because we know Him we can respond with trust in Him to save and protect us. We are certain that He will not forsake those who seek Him. And so we look for Him, in every circumstance. Therefore, we sing praises to the God who saves us, to the Lord who dwells with His people, to Jesus who is present in our bodies as the temple of the Lord. How can we not respond with praise to such a wonderful Jesus? And then we tell everyone what He has done. We declare His doings by supporting the preaching of the Gospel in our home, in our church, in our community, and in the whole world.