How do we know that Jesus is the door to salvation?

In scripture, Jesus identifies Himself as the 'door' of the sheepfold (John 10:9), which signifies that He is the exclusive path to salvation. According to the Reformed theological perspective, this means that no one can enter into fellowship with God except through faith in Jesus Christ. The Bible consistently emphasizes that salvation is by grace alone, through faith alone, in Christ alone, affirming that He is the only mediator between God and man (1 Timothy 2:5). This necessity of coming through the door highlights the centrality of Christ in redemptive history and assures believers of their security in Him, as they enter into eternal life.