And Saul saw and knew that the LORD was with David, and that Michal Saul’s daughter loved him.  And Saul was yet the more afraid of David; and Saul became David’s enemy continually. Then the princes of the Philistines went forth: and it came to pass, after they went forth, that David behaved himself more wisely than all the servants of Saul; so that his name was much set by.
1 Samuel 18:28-30

King Saul had grown envious of David. Why?  Because Saul could see and he knew that the Spirit of the LORD had left himself, and was now in his servant David.

Why had the Spirit of the LORD departed from Saul?  The king had been disobedient too many times. Some of the times his disobedience was due to his arrogance and pride. Those things can get in the way of behaving wisely.

The Spirit of the LORD was within David from the moment Samuel anointed David as the next king of Israel (1 Samuel 16:12-13). To make one thing clear for the Spirit of the LORD – He can dwell within many at the same time; because the Spirit of the LORD was on and in Samuel as well. It was because of David’s love for the LORD God, and thankfulness for His work in his life that he behaved himself wisely as he went out, and as he came in

Saul was afraid of David, also because he could see, and he knew that the LORD was with David. When the Spirit of the LORD is with you, and you know it, there is nothing you have to fear. You are at peace, you have faith, and confidence that the LORD is working in and through your life, and that nothing can get in the way of the Lord’s working in you.

Behaving wisely is  work of the Holy Spirit of God in the follower, the disciple of Jesus Christ today. Behaving wisely does not mean doing whatever I want with my life. Behaving wisely means following the Lord’s direction for one’s life; going where He goes, doing what He does, loving like He does, and loving what and who He does, and also hating what He hates.

We cannot behave wisely apart from the Spirit of the LORD, whom we know as the Holy Spirit given to everyone who comes by faith to the Lord Jesus Christ in  repentance, confessing one’s sin, turning from sin to Christ believing Him and His work on the cross dying for the sins of the world, His burial, and resurrection. When you have received this free gift of grace God gives us His Holy Spirit, and then we will begin “Behaving Wisely.” Also read Ephesians 2;8-10.