Here are a couple of fitting excerpts from The Age of Reason, also available online in its entirety through Project Gutenberg (among others).
Revelation, when applied to religion, means something communicated immediately from God to man. No one will deny or dispute the power of the Almighty to make such a communication, if he pleases. But admitting, for the sake of a case, that something has been revealed to a certain person, and not revealed to any other person, it is revelation to that person only. When he tells it to a second person, a second to a third, a third to a fourth, and so on, it ceases to be a revelation to all those persons. It is revelation to the first person only, and hearsay to every other, and consequently they are not obliged to believe it.
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The resurrection and ascension, supposing them to have taken place, admitted of public and ocular demonstration, like that of the ascension of a balloon, or the sun at noon-day, to all Jerusalem at least. A thing which everybody is required to believe, requires that the proof and evidence of it should be equal to all, and universal; and as the public visibility of this last related act was the only evidence that could give sanction to the former part, the whole of it falls to the ground, because that evidence never was given.
Instead of this, a small number of persons, not more than eight or nine, are introduced as proxies for the whole world, to say they saw it, and all the rest of the world are called upon to believe it. But it appears that Thomas did not believe the resurrection, and, as they say, would not believe without having ocular and manual demonstration himself. So neither will I, and the reason is equally as good for me, and for every other person, as for Thomas.