[ by Charles Cameron — a veritable rule of thumb ]
Let me steer clear of both foreign policy and presidential candidates, and simply quote Cheryl Rofer from her recent twitter fusillade re Neil deGrasse Tyson:
One of the things science can teach its practitioners is humility. Respect for others who know something you don't.
— Cheryl Rofer (@CherylRofer) March 13, 2016
Humility has as many applications as a Swiss Army Knife.