Definition and Overview:
True righteousness, as depicted in the Bible, is a state of moral purity and uprightness that aligns with God's standards. It is not merely an external adherence to laws or rituals but a profound inner transformation that reflects God's character. True righteousness is both a gift from God and a pursuit for believers, manifesting in their thoughts, actions, and relationships.

Biblical Foundation:
The concept of righteousness is central to the biblical narrative, beginning with God's own nature. In Genesis 15:6, Abraham's faith is credited to him as righteousness, establishing the principle that righteousness is linked to faith. The Berean Standard Bible states, "Abram believed the LORD, and it was credited to him as righteousness."

Old Testament Context:
In the Old Testament, righteousness is often associated with justice and ethical conduct. The Law given to Israel was a guide to living righteously. Deuteronomy 6:25 emphasizes this: "And if we are careful to observe every one of these commandments before the LORD our God, as He has commanded us, then that will be our righteousness."

The prophets frequently called Israel back to true righteousness, which involved not just ritual observance but justice, mercy, and humility. Micah 6:8 encapsulates this call: "He has shown you, O man, what is good. And what does the LORD require of you but to act justly, to love mercy, and to walk humbly with your God?"

New Testament Revelation:
In the New Testament, true righteousness is fully revealed in the person and work of Jesus Christ. Jesus critiques the superficial righteousness of the Pharisees, emphasizing the need for a righteousness that surpasses mere legalism. In Matthew 5:20 , Jesus declares, "For I tell you that unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven."

The Apostle Paul further expounds on righteousness as a gift from God through faith in Christ. Romans 3:22 states, "And this righteousness from God comes through faith in Jesus Christ to all who believe." This righteousness is not earned by works but is imputed to believers through faith, as seen in Philippians 3:9 : "And be found in Him, not having my own righteousness from the law, but that which is through faith in Christ—the righteousness from God on the basis of faith."

Practical Implications:
True righteousness involves a transformation of the heart and mind, leading to a life that reflects God's holiness. It is characterized by love, humility, and obedience to God's will. James 1:27 highlights practical righteousness: "Pure and undefiled religion before our God and Father is this: to care for orphans and widows in their distress, and to keep oneself unstained by the world."

Believers are called to pursue righteousness actively, as seen in 1 Timothy 6:11 : "But you, O man of God, flee from these things and pursue righteousness, godliness, faith, love, perseverance, and gentleness."

Conclusion:
The nature of true righteousness is deeply rooted in a relationship with God, marked by faith in Jesus Christ, and evidenced by a life of holiness and love. It transcends mere legalistic observance and is a reflection of God's own righteous character.