How do we know Jesus' sacrifice was sufficient for our salvation?

The sufficiency of Jesus' sacrifice is affirmed through his declaration from the cross, 'It is finished' (John 19:30). This statement indicates that all the work necessary for our redemption was completed in Him. Hebrews 10:14 reinforces this by stating, 'For by one offering he hath perfected forever them that are sanctified.' This signifies that His atoning work does not require additional sacrifices and that believers can rest in the finished work of Christ for their salvation. It embodies the hope and certainty we possess as those redeemed by His blood.