What does it mean to be a person after God’s own heart?  Seems to me, it means that you are a person whose life is in harmony with the Lord.

From 2 Peter 1:5-7:  “For this very reason, you must make every effort to support your faith with goodness, and goodness with knowledge, and knowledge with self-control, and self-control with endurance, and endurance with godliness, and godliness with mutual affection, and mutual affection with love.”