How do we know we are justified by grace through faith?

Paul emphasizes in Romans 3:24 that believers are 'justified freely by His grace through the redemption that is in Christ Jesus.' This sets the foundation for understanding our salvation, which is entirely a work of God's grace, not dependent on our merits or actions. Also, Philippians 1:6 reassures us that 'He which hath begun a good work in you will perform it until the day of Jesus Christ.' The consistency of God’s work from justification to glorification reinforces that our salvation rests on His promise and power, assuring us that our justification is both certain and rooted in the grace of Christ alone.