David was a man who knew how to look deeply within. He was flawed but understood that he wanted the love of friendship to dwell within him. In order for this to take place, he had to understand his mission. David is expressing his knowledge of the fact that God has penetrated to the core of his being and examined his character intently, and He understands David better than anyone else ever could.
Psalm. 139:1 O LORD, thou hast searched me, and known me.
The word for known indicates the results of that examination; David was God’s “familiar friend.” I think that truth can be verified with scripture that identifies David as a man after God’s own heart.
Experience has shown me that the best friends are those who share your heart, your interests, who love the things you love, who have the same concerns, who are considerate of you. The truth is that God has “searched” each one of us. My desire is to also be known by Him as a “familiar friend,” to have a character that embraces the things He loves, that is jealous for His name, that lives to see Him glorified in me.