actually this is NOT a verse from the Bible, just a cliched
phrase. There is probably very little theological support for
it.
Might want to look at it this way: there are many things that are
humanly possible and controllable, but there are also many things
that are beyond us. We can sit around and wait for things to happen
and blame God for all that has happened, or to just do it, but pray
for a divine hand into the way we handle those
situations.