Why does edwards claim that nonbelievers are akin to spiders in "sinners in the hands of an angry god"?

". . and your own care and prudence, and best contrivance, and all your righteousness, would have no more influence to uphold you and keep you out of hell, than a spider's web would have to stop a falling rock."

i. spiders are considered to be errors of god’s creation.
ii. spiders are powerless should a rock fall on them.
iii. spiders are considered the lowest form of life and thus expendable.

i

ii

iii

i and ii

i and iii