Matthew Poole and continuators on Luke 24:37

37 But they were terrified and affrighted, and supposed that they had seen a spirit.

Spirits sometimes (by Gods permission, or direction) assumed humane shapes. They seeing an humane shape, and not able on the sudden to conceive, how an humane Body should come into the midst amongst them, without any more noise, or notice taken of it, were affrighted, as we usually are, at the sight of apprehended Apparations. From hence we may conclude, That either the World, and the best Men in it, have been in all Ages deceived, and a few Atheists have been wiser than them all, or there are such Beings as Spirits.