Is to understand his way - Instead of הבין habin, to understand, הכין hachin, to Direct his way, is found in one MS. It makes a very good sense.
The Hebrew counterpart to the Greek “Know thyself.” “The highest wisdom is for a person to understand his own way. The most extreme folly is self-deceit.” The word “deceit” may, however, involve fraud practiced upon others. The folly of fools shows itself then in their ceaseless effort to deceive.