1st Samuel 18:5 And David went out whithersoever Saul sent him, and behaved himself wisely: and Saul set him over the men of war, and he was accepted in the sight of all the people, and also in the sight of Saul's servants.
There is a huge difference between good behavior, and conversion, and the two should never be mixed up by those who desire sanctification, according to the will of God. A person can behave well, by doing what is morally right, by abiding by the laws of the land, by paying their taxes on time, and maintaining a good credit score.
There are good citizens who manifest courtesy, and respect for others, who may speak perfect English, and are achievers, as they pursue stellar careers in different fields, who make meaningful contributions to society, who never use foul language, and they’re looked up to by others as role models.
There are very many Christians in our day, who fall into these categories, and to all appearances, some are in good and regular standing, according to what can be seen externally. These qualities ought to be commended, for a good Christian should also be a good citizen who tries his or her best to behave well and stay out of trouble.
1st Samuel 18:14 And David behaved himself wisely in all his ways; and the Lord was with him. 15 Wherefore when Saul saw that he behaved himself very wisely, he was afraid of him.
May God add His blessing to the study of His word. “Good night” and God bless!