John 20:29-33

Jesus *said to him, “Because you have seen Me, have you now believed? Blessed are they who did not see, and yet believed.” Why This Gospel Was Written

So then, many other signs Jesus also performed in the presence of the disciples, which are not written in this book;

but these have been written so that you may believe that Jesus is the Christ, the Son of God; and that by believing you may have life in His name.