How do we know that Jesus prayed for all believers?

The assurance that Jesus prayed for all believers is captured in His words in John 17:20, where He says, 'Neither pray I for these alone, but for them also which shall believe on me through their word.' This declaration illustrates the scope of His intercession, highlighting the fact that His prayer encompasses all who would come to faith based on the testimony of His original apostles. Jesus' prayer signifies the continuity of faith and the assurance that all whom the Father has chosen are included within His redemptive work. This truth encourages believers today, as we understand that Christ's mediation and advocacy extend to all His people throughout history, affirming the security of their salvation in Him.