Opportunity still visits the neighborhood, but the path leading to Mister Numbskull's home is grown up in weeds.
The fact is that our real opportunity _knocks from within_.

Through experience, built upon consecutively by continuous effort, our vision expands and pounds its way out through the portals of our brain.

We see the thing that we ought to do and _we go to it_! To the man who didn't see it _the opportunity did not exist_.
"What we don't know doesn't hurt us any"-- so runs the old saw.

And here's a case where we who didn't see, _were_ hurt, but we didn't know it.
For those of us who have vision there are all sorts of opportunities, but many of them are not good for us.

The ones we make for ourselves are the healthy ones, and generally they are the best for us.