How do we know that Christ's sacrifice was enough for our sins?

The sufficiency of Christ's sacrifice is affirmed through the completed work on the cross, where He bore the sins of His people in full. The Scriptures assure us that Christ's sacrifice not only bore our sins but also eradicated them wholly. God has accepted this sacrifice, evidenced by Christ’s resurrection, which confirms that justice has been satisfied (Isaiah 53:5-6, Hebrews 10:12). Our sin is washed away, and God's wrath towards us is appeased; thus, we can know with assurance that we are forgiven in Him.