Preserve the core, and let the rest flux. In their wonderful bestseller Built to Last, authors James Collins and Jerry Porras make a convincing argument that long-lived companies are able to thrive 50 years or more by retaining a very small heart of unchanging values, and then stimulating progress in everything else. At times "everything" includes changing the business the company operates in, migrating, say, from mining to insurance. Outside the core of values, nothing should be exempt from flux. Nothing.
Kevin KellyThis is actually a very important principle that science is learning about large systems like evolution and that futurists are learning about anticipating human society: just because a future scenario is plausible doesn't mean we can get there from here.
Kevin KellySince a relationship involves two members investing in it, its value increases twice as fast as one's investment.
Kevin Kelly