God originally made everything from nothing, perfect. He made our first parents, Adam and Eve, the root of mankind, both upright and able to keep the law written in their hearts. This law they were naturally bound to obey upon penalty of death. God was not bound to reward their service, till he entered into a covenant or contract with them, and their posterity in them. He promised to give them eternal life, upon condition of perfect personal obedience. If they failed they would die. This is the covenant of works.
—Sum of Saving Knowledge (1647)