I will sing of the mercies of the Lord for ever: with my mouth will I make known Thy faithfulness to all generations.@Psalm 89:1
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Isaac Watts (1674-1748)

Isaac Watts, The Psalms of David 1719.

Caithness Scottish Psalter, 1635 (🔊 pdf nwc).

My never ceasing songs shall show
The mercies of the Lord;
And make succeeding ages know
How faithful is His Word.

The sacred truths His lips pronounce
Shall firm as Heav’n endure;
And if He speak a promise once,
Th’eternal grace is sure.

How long the race of David held
The promised Jewish throne!
But there’s a nobler covenant sealed
To David’s greater Son.

His seed for ever shall possess
A throne above the skies;
The meanest subject of His grace
Shall to that glory rise.

Lord God of hosts, Thy wondrous ways
Are sung by saints above;
And saints on earth their honors raise
To Thy unchanging love.