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.
Gallery of sacred pictures manifold,
A minster rich in holy effigies,
And bearing on entablature and frieze
The hieroglyphic oracles of old.
Along its transept aureoled martyrs sit;
And the low chancel side-lights half acquaint
The eye with shrines of prophet, bard, and saint,
Their age-dimmed tablets traced in doubtful writ!
But only when on form and word obscure
Falls from above the white supernal light
We read the mystic characters aright,
And life informs the silent portraiture,
Until we pause at last, awe-held, before
The One ineffable Face, love, wonder, and adore.