Psalms 29:9
The voice of the LORD maketh the hinds to calve, and discovereth the forests: and in his temple doth every one speak of his glory. The voice of the LORD maketh the hinds to calve, and discovereth the forests: and in his temple doth every one speak of his glory.
In God's temple everyone speaks of His glory. This speaking is speaking of Christ's excellencies. It is praising the glory revealed in the plan of redemption and in Christ's death on the cross.
The redeemed will fulfill this in a song drawn from their own experience. That song will declare God's works to be great and marvelous. It will declare His ways to be righteous and true and Himself to be holy. It will call all to fear Him and glorify His name.