Date: 1800-1803

"And these are the gems of the Human Soul"

— Blake, William (1757-1827)

Date: 1800-1803

"The countless gold of the akeing heart"

— Blake, William (1757-1827)

Date: 1803

"Charms with soft words, and sooths with amorous wiles, / Her iron-hearted Lord,--and Pluto smiles."

— Darwin, Erasmus (1731-1802)

Date: c. 1804-1811, 1818

"For every human heart has gates of brass & bars of adamant, / Which few dare unbar because dread Og & Anak guard the gates"

— Blake, William (1757-1827)

Date: 1804

"The Spectre is the Reasoning Power in Man; & when separated / From Imagination, and closing itself as in steel, in a Ratio / Of the Things of Memory"

— Blake, William (1757-1827)

Date: 1806

"I'll hear no tales, listen to none of the charities of life: my heart is steeled"

— Holcroft, Thomas (1745-1809)

Date: 1806

"Shall the caprice of nature, the deep tint / Of sultry climes, the feature varying, / Or the uncultur'd mind, endure the scourge / Of sordid tyranny, or heap the stores / Of his fair fellow man, whose ruddy cheek / Knows not the tear of pity; whose white breast / Conceals a heart, than adamant m...

— Robinson [Née Darby], Mary [Perdita] (1758-1800)

Date: w. 1797-1807, published 1893

"With tears of sorrow incessant she labourd the food of Orc / Compelld by the iron hearted sisters Daughters of Urizen"

— Blake, William (1757-1827)

Date: w. 1797-1807, published 1893

"Weeping at the threshold of Existence I will steel my heart / Against thee to Eternity & never recieve thee more"

— Blake, William (1757-1827)

Date: [1805?] 1810, 1812, 1818

"Where bloody Butler's iron-hearted crew, / Doomed to the flames the weak submitting few"

— Wilson, Alexander (1766-1813)