How do we know Jesus' sacrifice is effective for salvation?

We find assurance in the truth that Jesus' sacrifice was foreordained and purposeful. The Bible assures us that in Christ, sin was atoned for, fulfillment of the law was accomplished, and eternal life was given to all who believe (John 3:16). His death was not in vain; it accomplished God’s eternal purpose and secured salvation for all the elect. As noted in John 10:28, He gives eternal life to His sheep, and none shall be lost. This effectual work brings believers to repentance and faith, highlighting the powerful outcome of His atoning death.