“When working on a design project, at first I carefully listen to how you talk about your task, and I read all the reference materials I find on the problems you face. If you're lucky, I happen to have personal experience working in a situation similar to yours. A design idea pops into my head along the way, out of nowhere. I can not explain it; It's akin to magic. Sometimes this happens even before you have time to tell me about your task! If the idea is good, I try to come up with a strategic rationale for such a decision so that I can explain it to you without relying on good taste that you may not have. I may come up with other ideas along the way, either because you made me agree to it, or because I'm not sure about the first idea. Anyway, I hope that early on, I will be able to gain your trust and by this time you will be ready to accept my recommendations. I have no idea how you are going to test their suitability, except that in the past other people - at least the ones I told you about - have followed my advice and have succeeded. In other words, could you just, you know ... believe me? '
From the book “Now You See It and Other Essays”.