Use of the Term Might Be a Bit Stuffy, But It’s an Important Concept

From What is PrelestĚ?:

The term prelest is a Russian word which has come into Englisg usage for lack of a precise equivalent, although it is often translated as “spiritual delusion ,” “spiritual deception,” or “illusion,” accepting a delusion for reality in contrast to spiritual sobriety. Prelest carries a connotation of allurement in the sense that the serpent beguiled Eve by means of the forbidden fruit. (Apart from its spiritual context, the word in Russian is often used in a positive sense of something charming, “lovely.”)

The site then quotes from St. Ignatius Brianchaninov and Archbishop Theophan of Poltava. First St. Ignatius:

Spiritual deception is the wounding of human nature by falsehood. Spiritual deception is the state of all men without exception, and it has been made possible by the fall of our original parents. All of us are subject to spiritual deception. Awareness of this fact is the greatest protection against it. Likewise, the greatest spiritual deception of all is to consider oneself free from it. We are all deceived, all deluded; we all find ourselves in a condition of falsehood; we all need to be liberated by the Truth. The Truth is our Lord Jesus Christ (John 8:32-14:6). Let us assimilate that Truth by faith in it; Let us cry out in prayer to this Truth, and it will draw us out of the abyss of demonic deception and self-delusion. Bitter is our state! It is that prison from which we beseech that our souls be led out ,that we may confess the name of the Lord(Ps. 141:8). It is that gloomy land into which our life has been cast by the enemy that hates and pursues us. It is that carnal-mindedness (Rom. 8:6) and knowledge Falsely so-called (I Tim. 6:20) wherewith the entire world is infected, refusing to acknowledge its illness, insisting, rather, that it is in the bloom of health. It is that “flesh and blood” which “cannot inherit the Kingdom of God”(I Cor. 15:50). It is that eternal death which is healed and destroyed by the Lord Jesus, Who is “the Resurrection and the Life” (John 11:25). Such is our state.

Archbishop Theophan expounds on this:

It is evident from these words of Isaac the Syrian that what we call prelest proper exists when a man starts trying to live above his capabilities. Without having cleansed himself of passions, he strives for a life of contemplation and dreams of the delights of spiritual grace. Thus the wrath of God befalls a man; because he thinks too highly of himself, God’s grace is withdrawn from him and he falls under the influence of the evil one who actively begins to tickle his vainglory with lofty contemplation and [spiritual] delights…

Briefly, the difference between “general prelest” and prelest in the particular sense of the word can, on the basis of the above. be expressed thus. General prelest is forgetting and not noticing one’s sinfulness. That which we call prelest proper is attributing to oneself righteousness when it does not actually exist. If a man thinks he is righteous, then his righteousness is not divine, but diabolical, foreign to the grace of God and to humility. One should recall the famous saying of Abba Poemen the Great: “I prefer a man who sins and repents to one who does not sin and does not repent. The first has good thoughts, for he admits that he is sinful. But the second has false, soul-destroying thoughts, for he imagines himself to be righteous” (Bp. Ignatius, Patericon, 75).

The Church Is One

Khomiakov: The Church is One:

The Church is one. Her unity follows of necessity from the unity of God; for the Church is not a multitude of persons in their separate individuality, but a unity of the grace of God, living in a multitude of rational creatures, submitting themselves willingly to grace. Grace, indeed, is also given to those who resist it, and to those who do not make use of it (who hide their talent in the earth), but these are not in the Church. In fact, the unity of the Church is not imaginary or allegorical, but a true and substantial unity, such as is the unity of many members in a living body.

The Church is one, notwithstanding her division as it appears to a man who is still alive on earth. It is only in relation to man that it is possible to recognize a division of the Church into visible and invisible; her unity is, in reality, true and absolute. Those who are alive on earth, those who have finished their earthly course, those who, like the angels, were not created for a life on earth, those in future generations who have not yet begun their earthly course, are all united together in one Church, in one and the same grace of God; for the creation of God which has not yet been manifested is manifest to Him; and God hears the prayers and knows the faith of those whom He has not yet called out of non-existence into existence. Indeed the Church, the Body of Christ, is manifesting forth and fulfilling herself in time, without changing her essential unity or inward life of grace. And therefore, when we speak of the Church visible and invisible, we so speak only in relation to man.

The Church visible, or upon earth, lives in complete communion and unity with the whole body of the Church, of which Christ is the Head. She has abiding within her Christ and the grace of the Holy Spirit in all their living fullness, but not in the fullness of their manifestation, for she acts and knows not fully, but only so far as it pleases God.

Inasmuch as the earthly and visible Church is not the fullness and completeness of the whole Church which the Lord has appointed to appear at the final judgment of all creation, she acts and knows only within her own limits; and (according to the words of Paul the Apostle, to the Corinthians, 1 Cor. 5. 12) does not judge the rest of mankind, and only looks upon those as excluded, that is to say, not belonging to her, who exclude themselves. The rest of mankind, whether alien from the Church, or united to her by ties which God has not willed to reveal to her, she leaves to the judgment of the great day. The Church on earth judges for herself only, according to the grace of the Spirit, and the freedom granted her through Christ, inviting also the rest of mankind to the unity and adoption of God in Christ; but upon those who do not hear her appeal she pronounces no sentence, knowing the command of her Saviour and Head, not to judge another man’s servant (Rom. 14. 4).

[Read it all at the link above.]