Elsewhere, a commentator asked: Where do I find the Ramban on Hashgacha Klalit?
This is a customer-service oriented blog, so here's an example: Know further that miracles for good or for bad are performed only for the perfectly righteous or utterly wicked people. For average people, however, He visits good or evil upon them in a natural manner according to their ways, and by their doings.
Ramban. Duet 11:13