This question is based on General Literary Appreciation.
Fights by the book of arithmetic
The figure of speech in the line above is
This question is based on General Literary Appreciation.
'I have said too much unto a heart of stone,
And laid my honour too unchary on it',
There's something in me that reproves my fault,
But such a headstrong potent fault it is
That it but mocks reproof.'.
William Shakespeare: Twelfth Night
A heart of stone in the lines above is an example of