How do we know God's covenant is eternal?

The eternal covenant of grace is consistently affirmed in Scripture, particularly noted in passages such as Ezekiel 36 and Hebrews 8. God's declarations, 'I will be your God, and you shall be My people,' signify a perpetuity that cannot be altered. This covenant encompasses God's sovereignty and His assurance that He will fulfill His promises. Additionally, the new covenant is established not upon human deeds but upon divine provisions and assurances, further reinforcing its eternal nature and reliability.