Verse

John 20:30

A church father on this verse
Since this Evangelist hath mentioned fewer than the others, he tells us that neither have all the others mentioned them all, but as many as were sufficient to draw the hearers to belief. For, "If," it saith, "they should be written every one, I suppose that even the world itself could not contain the books." Whence it…
John Chrysostom, 5th c. — Homily on the Gospel of John 87
Original

30And many other signs truly did Jesus in the presence of his disciples, which are not written in this book:

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In context

28And Thomas answered and said unto him, My LORD and my God.

29Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.

John 20:30

31But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.

Read all of John 20