A Doubting Thomas is someone who will refuse to believe something without direct, physical, personal evidence; in other words, a skeptic.
Famous quotes containing the words doubting and/or thomas:
“As soon as by one’s own propaganda even a glimpse of right on the other side is admitted, the cause for doubting one’s own right is laid.”
—Adolf Hitler (1889–1945)
“Dark is a way and light is a place,
Heaven that never was
Nor will be ever is always true....”
—Dylan Thomas (1914–1953)