So if I have it right, God
managed to come up with ten
plagues for Moses to visit
on Pharaoh, although at the time
Moses probably could not
understand why it was ten,
since God was boundlessly
creative, or so He told Moses.

Maybe it dawned on Moses
when wandering in the desert
that ten was a convenient number,
after all, he only gave Moses
ten commandments, but I doubt
he told Moses they were
a starter set and the other
603 would come along
in due course, but Moses
wouldn’t take the blame
for them, he’d be written
out of the story in Book Two.