The metaphor I started using is that Triumph over Time is like a wine reduction. If the works of everyone referenced in the back of the book (and beyond) were analogous to grapes then, over the years, the ideas have had the chance to mature into multiple wines, each with a subtle nuance all their own.
I've taken them home. Tried them out individually, collectively at various ratios, and shared them with friends, family, and clients. Then, I poured what could be the perfect ratio into a pot, added subtle nuances of my own, and let it simmer, until all of it could fit in one bottle.