What does the Bible say about true believers?

True believers are characterized by their worship of God in the spirit, as highlighted in Philippians 3:3. This worship is an inward act of reverence that comes from a broken heart rather than outward rituals. Furthermore, true believers rejoice in Christ Jesus, boasting in what He has accomplished through His sacrifice on the cross. They recognize that their righteousness comes not from themselves, but through faith in Christ, who fulfilled the law and satisfied God's justice. Importantly, true believers place no confidence in their flesh or personal achievements, understanding that all merit stands in Christ alone.