(4.) That Jesus Christ should be the centre of unity to all God's spiritual Israel. They shall all agree to appoint to themselves one head, which can be no other than he whom God has appointed, even Christ. Note, Jesus Christ is the head of the church, the one only head of it, not only a head of government, as of the body politic, but a head of vital influence, as of the natural body. To believe in Christ is to appoint him to ourselves for our head, that is, to consent to God's appointment, and willingly commit ourselves to his guidance and government; and this in concurrence and communion with all good Christians that make him their head; so that, though they are many, yet in him they are one, and so become one with each other. Qui conveniunt in aliquo tertio inter se conveniunt—Those who agree with a third agree with each other.