So the other disciples were saying to him, "We have seen the Lord!" But he said to them, "Unless I see in His hands the imprint of the nails, and put my finger into the place of the nails, and put my hand into His side, I will not believe." John 20:25
"Let us never set down men in a low place, as graceless and godless, because their faith is feeble and their love is cold. Let us remember the case of Thomas, and be very pitiful and of tender mercy. Our Lord has many weak children in His family, many dull pupils in His school, many raw soldiers in His army, many lame sheep in His fold. Yet He bears with them all, and casts none away. Happy is that Christian who has learned to deal likewise with his brethren. There are many in the Church, who, like Thomas, are dull and slow, but for all that, like Thomas, are real and true believers." ~J.C. Ryle on 'Forbearance'
Click Link Below for further study...
Common Men, Uncommon Calling: Matthew and Thomas by John MacArthur