"We are too often blinded by our ignorance of our ignorance, and our pursuit of knowledge is no guarantee of wisdom. Hence, we are prone to becoming the blind leading the blind because our overemphasis on competition in nearly everything makes looking good more important than being good. The resultant fear of being thought a fool and criticized therefore is one of greatest enemies of true learning."
This passage has been quoted from our local text.
I wonder why the author has left out 'the' before 'greatest' in the sentence above, since I understand 'the' can't be omitted when the superative is modified by a defining expression - 'of true learning'.
I would appreciate on your response.