PASSIONS, in Medicine, make one of the non-
naturals, and produce very sensible effects. Joy, an-
ger, and fear, are the principal. In the two first, the
spirits are hurried with too great vivacity; whereas,
in fear or dread, they are as it were curbed and con-
centrated: whence we may conclude, that they have a
very bad effect upon health; and therefore it will be
best to keep them within bounds as much as possible,
and to preserve an inward serenity, calmness, and tran-
quillity.