John Chrysostom

And see how putting them to shame, and forbiddingly he begins. "Impossible." No longer (he says) expect that which is not possible; (For he said not, It is not seemly, or, It is not expedient, or, It is not lawful, but "impossible," so as to cast [them] into despair), if ye have once been altogether enlightened.

Then he adds, "and have tasted of the heavenly gift. If ye have tasted" (he says) "of the heavenly gift," that is, of forgiveness. "And been made partakers of the Holy Ghost, and tasted the good word of God" (he is speaking here of the doctrine) "and the powers of the world to come" (what powers is he speaking of? either the working of miracles, or "the earnest of the Spirit" - 2 Cor. i. 22).

What is, "having tasted of the heavenly gift"? it is, "of the remission of sins": for this is of God alone to bestow, and the grace is a grace once for all. "What then? shall we continue in sin that grace may abound? Far from it!" (Rom. vi. 1, Rom. vi. 2.) But if we should be always going to be saved by grace we shall never be good. For where there is but one grace, and we are yet so indolent, should we then cease sinning if we knew that it is possible again to have our sins washed away? For my part I think not.

He here shows that the gifts are many: and to explain it, Ye were counted worthy (he says) of so great forgiveness; for he that was sitting in darkness, he that was at enmity, he that was at open war, that was alienated, that was hated of God, that was lost, he having been suddenly enlightened, counted worthy of the Spirit, of the heavenly gift, of adoption as a son, of the kingdom of heaven, of those other good things, the unspeakable mysteries; and who does not even thus become better, but while indeed worthy of perdition, obtained salvation and honor, as if he had successfully accomplished great things; how could he be again baptized?

"And tasted," he says, "the good word of God"; and he does not unfold it; "and the powers of the world to come," for to live as Angels and to have no need of earthly things, to know that this is the means of our introduction to the enjoyment of the worlds to come; this may we learn through the Spirit, and enter into those sacred recesses.

What are "the powers of the world to come"? Life eternal, angelic conversation. Of these we have already received the earnest through our Faith from the Spirit. Tell me then, if after having been introduced into a palace, and entrusted with all things therein, thou hadst then betrayed all, wouldest thou have been entrusted with them again?