Hey, Steve!
I do not know how all these people can come up with scripture the way they do. I guess the more you study the Word and give advise to others about it, you eventually learn it.
Here's something I started doing just recently:
When I come upon an interesting verse and want to remember it, I high-light it of course, but then I jot it down on a blank page in the front of my Bible, with a note, like: "without excuse"
Rom 1:20.
Of course, this can't last too long, as you only have a couple of blank pages in your Bible that you can write on. But, it has been very helpful for me when that subject comes up and I need to remember where I saw it. Just a suggestion.