"The more ignorant you are about a subject, the easier it seems to you.'"

From: http://ginstrom.com/scribbles/2011/01/13/the-dunning%E2%80%93kruger-effect-and-you:
            "The Dunning–Kruger effect is a cognitive bias in which unskilled people make poor decisions and reach erroneous conclusions, but their incompetence denies them the metacognitive ability to realize their mistakes." (Wikipedia)
As a corollary, the more we know about a subject, the more likely we are to know our limitations.
 “Fools rush in where Angels fear to tread.”
This is food for thought.