[29] Therefore, the unstable, and erroneous, and untrustworthy character of opinion is plain from this circumstance; for it anchors upon images and probabilities. And every image is deceitful, exhibiting itself by a certain attractive similarity in lieu of the original thing itself. But reason, which is the leader of the outward sense, thinking that the decision about all things which are perceptible only by the intellect, and which are always the same and in the same condition, belongs to itself, is convicted of being in error on many points. For when it directs its view to particular instances which are innumerable, it finds itself powerless, and unequal to the task, and faints under it, like a wrestler who is tripped up by some more mighty power;