1 Kings 3:3 And Solomon loved the Lord, walking in the statutes of David his father; only he sacrificed and burnt incense in high places.
Solomon loved the Lord and was obedient to the Law, except in one thing: he sacrificed at pagan worship sites. This one sin led to other sins, as he married many wives who brought their false gods and idols into the kingdom of God. With his God-given wisdom he ruled well, expanded the kingdom, and dwelt in peace. But the exceptions caused the ultimate division of a United Kingdom.
Most Christians live pretty good lives for the most part, but we still make exceptions, excuses, and rationalizations for our mistakes and shortcomings. But God is not impressed; He still demands perfect holiness in all things. He cannot make exceptions. But we, even good men, fall short of the glory of God. So in love He gave us His Son who graced us with God’s holiness and life. Now in Christ we are 100% acceptable to God.