Plutarch's Platonic questions (1.3-1.4)

Furthermore, if men can comprehend and know nothing, God did justly interdict Socrates the procreation of false and unstable discourses, which are like wind-eggs, and bid him convince others who were of any other opinion. And reasoning, which rids us of the greatest of evils, error and vanity of mind, is none of the least benefit to us; For God has not granted this to the Esculapians. [*] Nor did Socrates give physic to the body; indeed he purged the mind of secret corruption. But if there be any knowledge of the truth, and if the truth be one, he has as much that learns it of him that invented it, as the inventor himself. Now he the most easily attains the truth, that is persuaded he has it not; and he chooses best, just as he that has no children of his own adopts the best.

Mark this well, that poetry, mathematics, oratory, and sophistry, which are the things the Deity forbade Socrates to generate, are of no value; and that of the sole wisdom about what is divine and intelligible (which Socrates called amiable and eligible for itself), there is neither generation nor invention by man, but reminiscence. Wherefore Socrates taught nothing, but suggesting principles of doubt, as birth-pains, to young men, he excited and at the same time confirmed the innate notions. This he called his Art of Midwifery, which did not (as others professed) extrinsically confer intelligence upon his auditors; but demonstrated it to be innate, yet imperfect and confused, and in want of a nurse to feed and strengthen it.