#1 Rule of Investing: Be Flexible – Roy Nueberger

Never adopt permanently any type of asset or any selection method. Try to stay flexible, open-minded, and skeptical. – John Templeton

Pliability: Consider and reconsider the facts, and your opinions. Stubbornness as to opinions-“cockiness”-must be entirely eliminated. – Bernard Baruch

Ignore mechanical formulas – Phil Carret

If there is anything I detest, it’s a mechanistic formula for anything. People should use their heads and go by logic and reason, not by hard and fast rules. – Gerald Loeb

Empty your mind, be formless, shapeless–like water. Now you put water into a cup, it becomes the cup, You put water into a bottle, it becomes the bottle, You put it in a teapot, it becomes the teapot. Now water can flow or it can crash! Be water my friend. – Bruce Lee.   Ok, this quote comes from the world of martial arts, but the lesson transcends mere combat.