Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.
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John 20:27-31
Tyndale Open Study Notes (CC BY-SA 4.0).
20:29 Jesus points to the generations of Christians who, through the testimony of others, would believe without seeing.
Other Bible passages linked to this one, most cited first.
Whom having not seen, ye love; in whom, though now ye see him not, yet believing, ye rejoice with joy unspeakable and full of glory:
(For we walk by faith, not by sight:)
Now faith is the substance of things hoped for, the evidence of things not seen.
By faith he forsook Egypt, not fearing the wrath of the king: for he endured, as seeing him who is invisible.
And blessed is she that believed: for there shall be a performance of those things which were told her from the Lord.
Then said Jesus unto him, Except ye see signs and wonders, ye will not believe.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.