Let us not then be impatient to learn all things, but let us endure to be even ignorant of some things, that when we have found a teacher, we may not afford him double toil. Or rather many oftentimes have remained even incurably diseased, by carelessly entangling themselves in evil opinions. For neither is the toil the same to pluck up first what hath taken root amiss, and then to sow, as to plant a clear ground. For in that case, he must overthrow first, and then put in other things; but in this, the hearing is ready.