A man's lack of instinct.
Also by studies.
Answer:
Basically, the quote is saying if someone has the ability to do something but chooses not to do it, then they are no better than someone who isn't able to it.
Explanation:
The quote uses reading as an example. One who sees and has the ability to read but chooses not to read is not better than a blind person or someone who doesn't know how to read.
Sure, just post the questions.
