Psalms 135:5

For I know that the LORD is great, and that our Lord is above all gods.

The Lord is great and supreme above every other god. That greatness and supremacy give reason to praise Him. His goodness and His choice of Jacob and Israel as His own people stand alongside that truth as further reasons for praise.

That same greatness and supremacy also give reason to trust Him. Applied to the church as God's chosen people belonging to Him, it calls for acknowledging no authority or law but His own.