Please post all quotes separately, so that they can be voted up/down separately. (If they are strongly related, reply to your own comments. If strongly ordered, then go ahead and post them together.)
Do not quote yourself.
Do not quote comments/posts on LW/OB.
No more than 5 quotes per person per monthly thread, please.
I would say that advice from an experienced practitioner in a given field falls into a broad definition of "experimental reasoning", since at some stage they probably tried several approaches and found out the hard way which one worked.
You all know the rules: