Who shall explain the mystery?

Verse 1
Who shall explain the mystery?
God asks himself, how can it be?
Will such an harden’d race
Their stubborn unbelief let go,
Accept the land which I bestow,
And live the sons of grace?

Verse 2
Yes; for thou wilt thy Son reveal,
Th’ apostates with thy Spirit fill,
And take their sins away;
They then shall Abba Father cry,
And thee thro’ Jesus glorify
In one eternal day.

Hymnal/Album: Originally titled “But I said, How shall I put thee among the children, and give thee a pleasant land?... Thou shalt call me, My father, and shalt not turn away from me.”—[Jer.] iii. 19. Introduced in Charles Wesley, Short Hymns on Select Passages of the Holy Scriptures, Vol. 2 (Bristol: Farley, 1762). Published in The Poetical Works of John and Charles Wesley, Collected and Arranged by G. Osborn, Vol. 10 (London: Wesleyan-Methodist Conference Office, 1870), page 9.
Publishing: Public Domain