The way of a fool is right in his own eyes,but a wise man listens to advice.— Proverbs 12:15
What is the "way of a fool?" That is, what is it exactly that makes someone a fool? From the point of view of Proverbs, a fool is someone who despises wisdom and instruction (Proverbs 1:7). That's the reason why fools don't fear YAH, because the fear of YAH is the very beginning of wisdom and instruction (Proverbs 1:7). A fool is not necessarily stupid, but someone who refuses to submit to a proper understanding of YAH and HIS creation.
The fact that a fool despises wisdom and instruction is also the reason why "a fool is right in his own eyes." Instead of humbly submitting to wisdom and instruction, the fool thinks that his own way is the right way. The way of a fool is right in his own eyes because pride has taken over and prevented true insight into the way things really are. A fool would rather do things the way he thinks they should be done than do them the way they should be done.
What is a "wise man?" That is, what is it exactly that makes someone wise? From the point of view of Proverbs, a wise person is someone who values wisdom and instruction (Proverbs 1:1-6). That's the reason why the wise fear YAH, because the fear of YAH is the very beginning of wisdom and instruction (Proverbs 1:7). The wise are not necessarily smart, but those who are willing to submit to a proper understanding of YAH and HIS creation.