Learn to operate without strong beliefs. Everything is a guess. I don't care who you are; at least one thing you strongly believe is false. Be prepared.
It sounds like you fervently believe this; as it is a stance, not a state
of affairs, it certainly is not amenable to proof or disproof. Isn't
there a self-contradiction lurking somewhere when one presents as
an article of belief that one should believe nothing (whether you
append 'except this' or 'including this')? It appears rather
Zen/Tao/guruish to me... Joe