Date: 1611

"His heart is as firm as a stone; yea, as hard as a piece of the nether millstone."

— Author Unknown

Date: 1611

"And I will give them one heart, and I will put a new spirit within you; and I will take the stony heart out of their flesh, and will give them an heart of flesh."

— Author Unknown

Date: 1611

"Yea, they made their hearts as an adamant stone, lest they should hear the law, and the words which the LORD of hosts hath sent in his spirit by the former prophets: therefore came a great wrath from the LORD of hosts."

— Author Unknown

Date: 1651

"And as the Grindstone to unpolish'd Steel / Gives Edge, and Lustre: so my Mind, I feel / VVhetted, and glaz'd by Fortunes turning VVheel"

— Sherburne, Sir Edward (bap. 1616, d. 1702)