This text comes from The Complete Poetical Works of John Greenleaf Whittier, a historical songbook transcribed on Wikisource and reproduced from the pinned revision linked below.
Voice of the Holy Spirit, making known
Man to himself, a witness swift and sure,
Warning, approving, true and wise and pure,
Counsel and guidance that misleadeth none!
By thee the mystery of life is read;
The picture-writing of the world’s gray seers,
The myths and parables of the primal years,
Whose letter kills, by thee interpreted
Take healthful meanings fitted to our needs,
And in the soul’s vernacular express
The common law of simple righteousness.
Hatred of cant and doubt of human creeds
May well be felt: the unpardonable sin
Is to deny the Word of God within!