DUH! OF COURSE!
WHY IS THIS USED???
Using the phrase is simply intended to be a prompt to the brain to see that something is obvious and logical. Once that prompt occurs people tend to "remember" it better or "be able to recreate it easier".
When I taught accounting students, I trained them to think logically rather than to memorize. Much of the logical thinking is easily created later, simply by using logic. "What would logically occur next?" "What would this lead to, logically?"
Once your brain "gets" (understands the point) that something can logically be recreated later, it becomes more confident (as does its human), as it knows it can handle more of the things that come up. Once it sees, with this plus the other techniques on the site, that it can handle the future, it becomes relatively Fearless.
So, when I say after a statement "Duh! Of course!" I am attempting to have you see that you could say the same thing...and thereafter know that you can spot obvious truths or what obviously (logically) leads from one thing to another.
Let me be perfectly clear: I AM NOT saying "Duh! You dummy!" There is no judgment in it, just an attempt at getting the idea across objectively, wherein you can objectively (through unemotional logical thinking) determine that something is correct.
