john 20:25 The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe. - Free Bible Online

      25. We have seen the Lord--This way of speaking of Jesus (as Joh 20:20 and Joh 21:7), so suited to His resurrection-state, was soon to become the prevailing style.
      Except I see in his hands the print of the nails, and put my linger into the print of the nails, and thrust my hand into his side, I will not believe--The very form of this speech betokens the strength of the unbelief. "It is not, If I shall see I shall believe, but, Unless I shall see I will not believe; nor does he expect to see, although the others tell him they had" [BENGEL]. How Christ Himself viewed this state of mind, we know from Mr 16:14, "He upbraided them with their unbelief and hardness of heart because they believed not them which had seen Him after He was risen." But whence sprang this pertinacity of resistance in such minds? Not certainly from reluctance to believe, but as in Nathanael (see on Joh 1:46) from mere dread of mistake in so vital a matter.

JFB.