Personal experience, therefore, is everything in Zen. No ideas are intelligible to those who have no backing of experience.
Copying is slavery. The letter must never be followed, only the spirit is to be grasped. Higher affirmations live in the spirit. And where is the spirit? Seek it in your everyday experience, and therein lies abundance of proof for all you need.
Facts of experience are valued in Zen more than representations, symbols, and concepts-that is to say, substance is everything in Zen and form nothing.