Why is the rainbow a symbol of God's covenant?

In Genesis 9:13, the rainbow is established as the token of the covenant between God and Noah. It serves as a visible sign of God's grace and a reminder of His mercy, reinforcing the idea that despite humanity's sin, God remains committed to His creation. This imagery extends to how believers see God's mercy through Christ, emphasizing that all God's dealings with His people are governed by His covenants, illustrating their security in Him. The rainbow represents hope and assurance for believers that, through God's covenant, salvation is secure.