How do we know that salvation is in Christ?

The certainty of salvation being in Christ is supported by numerous scriptural references. Ephesians 1:4 expresses that believers have been chosen in Him for redemption. Furthermore, Jesus Himself states in John 17:2 that He gives eternal life to those whom the Father has given Him. It is clear from these passages that salvation is not a universal offer, but is specifically in Christ and pertains to those whom God has sovereignly chosen. This emphasizes the Reformed doctrine of election and particular redemption.