Ephesians 1:22-23, And He put all things in subjection under His feet, and gave Him as head over all things to the church, which is His body, the fullness of Him who fills all in all.
Leadership is crucial to the successful accomplishment of any goal. When Paul refers to Jesus as the head of the Church, he is referring to Jesus leadership. It is from Jesus that all things important begin and end. Christ is the foundation of our hope, our doctrine, our worship, and the behavior of the Church. He is the neurological from which our direction emanates. Jesus gives us unity across all that exists in the most substantial way. His leadership is exercised by virtue of the power of His Word. The Church knows how to worship Him and what kind of people we ought to be as a result of His spoken desire.
While headship implies authority, that is not all there is to our relationship with Jesus. He offers a leadership which includes our own best interest at all times. It is through Jesus that the Church finds the expression of righteous faith. Because He is the first-borne among the dead, (1 Corinthians 15:20) He is the hope of all who seek peace in the afterlife. He has become the head by virtue of the Father’s placement. (Matthew 28:18) He is the model of what we are to be, and the sacrifice for our own salvation to become possible. (1 Peter 2:21-24)