Walking a straight and honest path is a rare quality for any leader. A king faces endless choices and pressures, but true greatness often comes from staying strictly loyal to a righteous tradition.
The primary approach among commentators is that the king stayed completely true to the ways of his ancestor David. He did not wander off this established path in any direction. Instead, he maintained a life of total integrity. This presents a clear picture of a person whose behavior was entirely whole, honest, and without a single flaw.