The fourth verse we come to about the sluggard has to do with how his lack of any work ethic eventually affects his reason as well as his ego. He is wise in his own eyes - even though he does not put any work into what he thinks. He is a stranger to hard physical work - but now we learn he is also one to mental work as well. When he looks to someone for wisdom - he looks to himself. This is because of his ego - which is vastly overgrown while having no real reason to be so. He is too lazy to study - yet he thinks he knows far more than those who do. He is wiser than seven men who give a reasoned, well-studied, well-thought out answer. He is a genius in his own estimation - while his supposed genius is honestly ignorance of anything other than what he himself thinks. A legend in his own mind, he mentally gives himself the Nobel prize for everything.
Anyone who has ever done good academic work knows that this is no place for the sluggard. Good quality academic work requires painstaking study and hours of sacrifice both thinking and writing (not to mention re-writing). Someone who has expertice in a subject area has put in years of effort in order to have it. The whole idea of a "masters" degree is that someone has "mastered" a subject area. The seminary I attended required that we read a 300-500 page text for each course taken. But, this was not all we were required to do. We also were required to do extensive reading while preparing papers as well as do 1500 pages of outside reading on the subject. Even after all this effort, we were just barely beyond ignorant in the subjects we studied. Most areas of theology had literally thousands of texts written on it -some had hundreds of thousands.
The mental sluggard stands against seven men who work hard at honing their minds - and mocks all of them. He will take what little learning he has and string it together so as to think he is a mental heavyweight - when he doesn't even tip the scales of learning at a single pound. He spouts his opinion and then closes his mind to anything other than his highly self-valued moronity. He has no need to listen to others since his own ultimate genius has been voiced. Thus the mental sluggard continues his self-imposed banishment to ignorance in a miniature land of his own making.
A wise man knows that he does not yet know as he should know. He is teachable above all things - and is willing to spend more time gathering information than spouting it to others. He who holds his tongue and opens his mind is wise! He may not agree with what is said to him - yet he takes all things in an effort to become wiser still. He does not see himself as wise in his own eyes. He sees God as ultimately wise - and is actively looking for those who will speak according to God's wisdom. If you are a mental sluggard beware of lacking the wisdom of seeing yourself as not yet wise. Few things can dwarf your intellect and your spiritual acumen like being wise in your own eyes. It is proof that your field of spiritual and mental vision is extremely narrow.