St. Gregory of Nyssa on the Great Gulf

Luk 16:26 And besides all this, between us and you a great gulf has been fixed, so that those who desire to cross over from here to you are not able, nor may those from there cross over to us.

St. Gregory of Nyssa ca. 335-395
 
Those, then, whose reasoning powers have never been exercised and who have never had a glimpse of the better way soon use up on gluttony in this fleshly life the dividend of good which their constitution can claim, and they reserve none of it for the after life; but those who by a discreet and sober-minded calculation economize the powers of living are afflicted by things painful to sense here, but they reserve their good for the succeeding life, and so their happier lot is lengthened out to last as long as that eternal life. This, in my opinion, is the gulf; which is not made by the parting of the earth, but by those decisions in this life which result in a separation into opposite characters. The man who has once chosen pleasure in this life, and has not cured his inconsiderateness by repentance, places the land of the good beyond his own reach; for he has dug against himself the yawning impassable abyss of a necessity that nothing can break through. (On the Soul and Resurrection)