It's a common expression. We consider the two must go together, "How can we feel good if we're not secure?" Here's John's recent comment on An Exploration, Navigating Without a Map: Tony, I have read and re-read your original posting, and I think I have a better grip on where you are going with it. Qualitative v.s. quantitative differences are different as night and day. They are tangible v.s. intangible. Rational v.s. irrational.