I would like to quote John Cassian (
The Conferences of John Cassian-Part 1 - Chapter XIV.
Of the continuance of the soul):
Quote:
Wherefore every one while still existing in this body should already be aware that he must be committed to that state and office, of which he made himself a sharer and an adherent while in this life, nor should he doubt that in that eternal world he will be partner of him, whose servant and minister he chose to make himself here: according to that saying of our Lord which says “If any man serve Me, let him follow Me, and where I am, there shall My servant also be.”(John 12:26) For as the kingdom of the devil is gained by consenting to sin, so the kingdom of God is attained by the practice of virtue in purity of heart and spiritual knowledge. But where the kingdom of God is, there most certainly eternal life is enjoyed, and where the kingdom of the devil is, there without doubt is death and the grave. And the man who is in this condition, cannot praise the Lord, according to the saying of the prophet which tells us: “The dead cannot praise Thee, O Lord; neither all they that go down into the grave (doubtless of sin). But we,” says he, “who live (not forsooth to sin nor to this world but to God) will bless the Lord, from this time forth for evermore: for in death no man remembereth God: but in the grave (of sin) who will confess to the Lord?”(Psalm 6:6; 113:17, 18; 115:17) i.e., no one will. For no man even though he were to call himself a Christian a thousand times over, or a monk, confesses God when he is sinning: no man who allows those things which the Lord hates, remembereth God, nor calls himself with any truth the servant of Him, whose commands he scorns with obstinate rashness: in which death the blessed Apostle declares that the widow is involved, who gives herself to pleasure, saying “a widow who giveth herself to pleasure is dead while she liveth.”(1 Tim. 5:6) There are then many who while still living in this body are dead, and lying in the grave cannot praise God; and on the contrary there are many who though they are dead in the body yet bless God in the spirit, and praise Him, according to this: “O ye spirits and souls of the righteous, bless ye the Lord:”(Dan. 3:86 LXX) and “every spirit shall praise the Lord.”(Psalm 150:6) And in the Apocalypse the souls of them that are slain are not only said to praise God but to address Him also.(Cf. Rev. 6:9, 10) In the gospel too the Lord says with still greater clearness to the Sadducees: “Have ye not read that which was spoken by God, when He said to you: I am the God of Abraham, and the God of Isaac and the God of Jacob. He is not the God of the dead but of the living: for all do live unto Him.”(Matt. 22:31, 32) Of whom also the Apostle says: “wherefore God is not ashamed to be called their God: for He hath prepared for them a city.”(Heb. 11:16) For that they are not idle after the separation from this body, and are not incapable of feeling, the parable in the gospel shows, which tells us of the beggar Lazarus and Dives clothed in purple, one of whom obtained a position of bliss, i.e., Abraham’s bosom, the other is consumed with the dreadful heat of eternal fire.(Cf. Luke 16:19 sq.) But if you care too to understand the words spoken to the thief “To-day thou shalt be with Me in Paradise,”(Luke 23:43) what do they clearly show but that not only does their former intelligence continue with the souls, but also that in their changed condition they partake of some state which corresponds to their actions and deserts? For the Lord would certainly never have promised him this, if He had known that his soul after being separated from the flesh would either have been deprived of perception or have been resolved into nothing. For it was not his flesh but his soul which was to enter Paradise with Christ. At least we must avoid, and shun with the utmost horror, that wicked punctuation of the heretics, who, as they do not believe that Christ could be found in Paradise on the same day on which He descended into hell, thus punctuate “Verily, I say unto you to-day,” and making a stop apply “thou shalt be with Me in Paradise,” in such a way that they imagine that this promise was not fulfilled at once after he departed from this life, but that it will be fulfilled after the resurrection,* as they do not understand what before the time of His resurrection He declared to the Jews, who fancied that He was hampered by human difficulties and weakness of the flesh as they were: “No man hath ascended into heaven, but He who came down from heaven, even the Son of man who is in heaven:”(John 3:13) by which He clearly shows that the souls of the departed are not only not deprived of their reason, but that they are not even without such feelings as hope and sorrow, joy and fear, and that they already are beginning to taste beforehand something of what is reserved for them at the last judgment, and that they are not as some unbelievers hold resolved into nothing after their departure from this life:** but that they live a more real life, and are still more earnest in waiting on the praises of God. ---
*The punctuation which Cassian here mentions only to reject and which is rightly characterized by Alford as “worse than silly,” is also mentioned by Theophylact. Com. in loc.
**Augustine (De Hæres. c. lix.) speaks of “Seleuciani” or “Hermiani” as denying a visible Paradise, and a future resurrection; and again in c. lxxxiii. he speaks of some Arabian heretics, as teaching that the soul died and was dissolved (dissolvi) with the body and that it would at the end of the world be revived and rise again. These were the heretics of whom Eusebius speaks in his Eccl. History Book VI. c. xxxvii., where he tells us that they were successfully refuted by Origen. It is probably to this last error that Cassian is here making allusion.
(Schaff NPNF211 pp. 301-2)