The Lord does not look at the things man looks at. Man looks at the outward appearance, but the Lord looks at the heart

1 Samuel 16:1-23
How long will you mourn for Saul, since I have rejected him as king over Israel? Fill your horn with oil and be on your way; I am sending you to Jesse of Bethlehem. I have chosen one of his sons to be king.”
The Lord does not look at the things man looks at. Man looks at the outward appearance, but the Lord looks at the heart.
So Samuel took the horn of oil and anointed him in the presence of his brothers, and from that day on the Spirit of the Lord came upon David in power, Samul then went to Ramah.
Now the Spirit of the Lord had departed from Saul, and an evil spirit from the Lord tormented him.
Whenever the spirit from God came upon Saul, David would take his harp and play. Then relief would come to Saul; he would feel better, and the evil spirit would leave him.
On the basis of the first choice of king, Samuel might well have been looking for someone tall and handsome. But this time God makes it plain that he looks deeper. David may have sparkling eyes and the glow of health, but he is the least of his family, yet his heart is right. With the anointing, as in Saul's case, comes spiritual power. Again God chooses his man and prepares him long before he becomes a national figure. Learning to care for a wayward flock is no bad preparation for a leader.
When the Spirit of God leaves Saul, evil forces take charge. Saul is at the mercy of his own ungovernable temperament. His disordered mind plunges him into black depression and violence. But music can push back the shadows, and os Saul's need to become David's opportunity.
Why?
Samuel is fear the Lord and concerning the matter of the Lord, so he prayed to the Lord for a long time.
God's mind and eyes are different from men, God does not look at the outward appearance, but looks at the heart of men.
When the Holy Spirit is with us, the peace and power of the Lord will come with us.
When a man with the Holy Spirit, then the evil spirit is easy to occupy him.
How?
Do not look things at outward appearance, but the inner part. May God give me the wisdom to look things better.