"'How much more shall the blood of Christ who through the eternal Spirit offered himself without spot to God, purge your consciences from dead works to serve the living God?' The service of the living God is a consequence, note, of a purged conscience." JND

Works are the fruit of salvation, not the root. Likewise, works are the fruit of assurance, not the root.

@testing521 I feel like works aren't usually a fruit of assurance, whether they can be its root or not

@CalebDixonSmith Gratitude for God's free gift of grace, love for God in response to His love for us, is absolutely motivation for good works.