30 And truly Jesus did many other signs in the presence of His disciples, which are not written in this book; 31 but these are written that you may believe that Jesus is the Christ, the Son of God, and that believing you may have life in His name. (John 20:30–31, NKJV)
Genuine faith is not a blind leap into the unknown. It is a reasonable conviction based upon credible evidence (Heb. 11:1). In this case, faith that “Jesus is the Christ, the Son of God.” Neither does faith in Jesus as the Son of God mean that we must know of every sign He worked (v. 30; Jno. 21:25). What John wrote is true, and sufficient to produce faith leading to life in the name of Christ (v. 31; Jno. 21:24). We ask every honest seeker of truth to examine the works of Jesus; they have been on record for over two-thousand years. His miracles declare that the Father sent Him (Jno. 5:36; 14:11). His works are one reason to put your faith in Him and do His will to have eternal life (Jno. 5:36; 14:11; Matt. 7:21-23).