John Chrysostom
"If anyone cleanses himself from these, he will be a vessel for honor." Do you see that being golden or earthen depends not on nature or material necessity, but on our will?
In nature an earthen vessel cannot become golden, nor can a golden vessel become as low as an earthen one. But here, in human souls, there is a great change and transformation.
Paul was an earthen vessel, but became golden. Judas was a golden vessel, but became earthen. Thus impurity makes people earthen. The adulterer and the covetous man are earthen.
How then does the Apostle say elsewhere, "We have this treasure in earthen vessels" (2 Cor 4:7)? Does he not thereby avoid demeaning the earthen vessel and instead honor it, acknowledging that it can contain the treasure?
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In that passage he points to nature itself, not to the kind of material. The meaning of his words is this. Our body is an earthen vessel. As an earthen vessel is nothing other than baked clay, so our body is nothing other than earth held together by the warmth of the soul.
That it is an earthen vessel is clear. As an earthen vessel falls, breaks, and crumbles, so the body, when subjected to death, is dissolved. How do our bones, which are also hard and dry, differ from shards? How does flesh differ from clay? Is it not also made of water?
Why then, as I said, does he not demean the earthen vessel there? There he speaks of the nature of our body, but here of free will.
"If," he says, "anyone cleanses himself from these." He did not say, "is cleansing," but "cleanses," that is, cleanses completely. "He will be a vessel for honor, sanctified and useful to the Master." Therefore those vessels are unfit, though they serve some use.
"Prepared for every good work." Even if he is not yet acting, he is fit and capable. Therefore one must be ready for everything, even for death, even for martyrdom. One must prepare oneself for virginity and for all such things.