"Namque unam dicere causam
Non satis est, verum plures, unde una tamen sit."

[Lucretius, vi. 704.--The sense is in the preceding passage.]

Do you ask me, whence comes the custom of blessing those who sneeze?
We break wind three several ways; that which sallies from below is too
filthy; that which breaks out from the mouth carries with it some
reproach of gluttony; the third is sneezing, which, because it proceeds
from the head and is without offence, we give it this civil reception: do
not laugh at this distinction; they say 'tis Aristotle's.

I think I have seen in Plutarch' (who of all the authors I know, is he
who has best mixed art with nature, and judgment with knowledge), his
giving as a reason for the, rising of the stomach in those who are at
sea, that it is occasioned by fear; having first found out some reason by
which he proves that fear may produce such an effect. I, who am very
subject to it, know well that this cause concerns not me; and I know it,
not by argument, but by necessary experience. Without instancing what
has been told me, that the same thing often happens in beasts, especially
hogs, who are out of all apprehension of danger; and what an acquaintance
of mine told me of himself, that though very subject to it, the
disposition to vomit has three or four times gone off him, being very
afraid in a violent storm, as it happened to that ancient:

"Pejus vexabar, quam ut periculum mihi succurreret;"

["I was too ill to think of danger." (Or the reverse:)
"I was too frightened to be ill."--Seneca, Ep., 53. 2]