Do not seek the advice of him that is not thy fellow in behaviour, though he be very prudent. A layman who has experienced things is more to be trusted than a sage who speaks on the basis of theoretical knowledge but without experience.

What is experience? Experience is not this that a man goes and touches things, without acquiring knowledge concerning their advantages and their defects and without remaining with them during a certain time. How often the faces of things give the impressions of defect, whereas within them is found matter full of advantages. In the same way are to be judged things of the opposite aspect. - Pearls from Saint Isaac of Syria (From homily 39)