Consultancy can be too short or too long.

Experience doesn't necessarily teach anything.

The Fundamental Regulator Paradox ... The task of a regulator is to eliminate variation, but this variation is the ultimate source of information about the quality of its work. Therefore, the better the job a regulator does the less information it gets about how to improve.

Newton was a genius, but not because of the superior computational power of his brain. Newton's genius was, on the contrary, his ability to simplify, idealize, and streamline the world so that it became, in some measure, tractable to the brains of perfectly ordinary men.

No matter what the problem is, it's a people problem.