Christ's salvation is sufficient because He has fully accomplished the redemption of His people and fulfilled the law on their behalf.
The sufficiency of Christ's salvation is evident in His fulfillment of the law and the prophecies concerning our redemption. As Paul writes in Hebrews 1:3, after He had purged our sins, Christ sat down at the right hand of the Majesty on high, indicating the completion of His work. This confirms that there is nothing lacking in His sacrifice. The concept of double jeopardy illustrates this well; God cannot pour out justice on a person for whom Christ has already died. This guarantees that those who are in Christ have their debts paid and are justified before God, confirming the assurance that His salvation is entirely sufficient for all who believe.
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