"Nathan the Prophet"
Nathan the Prophet delivering God's messages to King David
Public DomainNathan the Prophet delivering God's messages to King David - Credit: Palma il Giovane

Nathan also appears in 2 Samuel, serving as the conduit between God and David. Having promised to establish the House of David for the glory of his descendents, God is furious at the king’s relations with Bathsheba and sends Nathan to remonstrate:

Wherefore hast thou despised the commandment of the Lord, to do evil in his sight? thou hast killed Uriah the Hittite with the sword, and hast taken his wife to be thy wife, and hast slain him with the sword of the children of Ammon. Now therefore the sword shall never depart from thine house; because thou hast despised me, and hast taken the wife of Uriah the Hittite to be thy wife. Thus saith the Lord, Behold, I will raise up evil against thee out of thine own house, and I will take thy wives before thine eyes, and give them unto thy neighbour, and he shall lie with thy wives in the sight of this sun. For thou didst it secretly: but I will do this thing before all Israel, and before the sun. (2 Samuel 12:9-12) 

In his mercy, God withdraws the threat of death from David’s head but takes the life of the child resulting from his illicit liaison with Bathsheba. 

Chillingworth’s parallel with Nathan — the revealer of adulterous relations and conveyer of their punishment — is unmissable.