How do we know the new covenant is necessary?

The necessity of the new covenant is clearly articulated within the context of Hebrew scriptures, particularly in Jeremiah 31. The old covenant, based on law and works, served to expose sin and demonstrate the inability of humanity to achieve righteousness on their own. This covenant was always intended to point towards the necessity of a Savior—Jesus Christ—who fulfills the law and offers an everlasting promise of grace. The new covenant supersedes the old as it brings a definitive solution to sin, offering complete and eternal redemption through Christ's sacrifice, thus making it not only necessary but utterly essential for salvation.