OF THIS I AM ABSOLUTELY CERTAIN

"The most learned are often the most narrow minded."

William Hazlitt

Late 18th/early 19th century British essayist

Certainly so the more we view our "knowledge" as irrefutable.

Be proud of what you know but do all you can to make sure you really do know it.

And even then, when you are certain, don't always attempt to force it on others.