adamant

This then is and alwayes hath ben the fashion of Worldlinges, & reprobate persons, to harden their hartes as an adamant stone, against anye thinge that shalbe tolde the for amendement of their lives, and for the savinge of their soules.

Actual life might seem to her so real that she could not detect the union of shadow and adamant that men call poetry.

You draw me, you hard-hearted adamant:

But yet you draw not iron, for all my heart

Is true as steel. Leave you your power to draw,

And I shall have no power to follow you.