1 Follow after charity, and desire spiritual gifts, but rather that ye may prophesy.
2 For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
3 But he that prophesieth speaketh unto men to edification, and exhortation, and comfort.
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Paul clearly distinguishes ordinary ecstasy with glossolalia from prophecy. The difference is clear: glossolalia, 'speaking in tongues,' is only a kind of unusual ecstatic state in which the boundary between consciousness and the unconscious is erased, including the unconscious dimension of language. The structures of a native language are rooted deeply in the subconscious of its speaker, but normally a person does not notice this linguistic subconscious.
When a person enters ecstasy, the boundaries of perception expand, and what is not perceived in an ordinary state becomes perceptible. This applies fully to language as well: in a state of ecstasy a person at times begins to 'utter' something in an incomprehensible 'language.' In reality, of course, this should be called quasi-speech activity, when the linguistic subconscious brings to the surface what normally serves only as the phonetic and grammatical matrix for meaningful and conscious speech.
Sometimes such a matrix can be taken for speech in an unknown and incomprehensible language. In ecstasy a person often does not keep track of what he is saying and can take such meaningless muttering for speech. Such quasi-speech activity can sometimes testify to real ecstasy, though not always, but for those around the speaker, and also for the speaker himself, it is useless.
Prophecy is different: here we are speaking of a conscious revelation received by a person, as a rule not for himself alone but also for others, sometimes even for the whole community to which he belongs. Such prophecy truly serves for edification. But that is not the only point. The point is also that conscious revelation is itself a way of deeper communion with God than a half-conscious, or even entirely unconscious and therefore uncontrolled, ecstasy, even if such ecstasy is real and connected with the action of God.
This is simply because in communion with God and in spiritual life the main thing is awareness: only awareness changes a person truly deeply and durably. Unconscious spiritual states either pass without a trace or have only a small effect on human nature. That is why the apostle notes the importance of the prophetic gift, of conscious spiritual life: life in the Kingdom is not a series of ecstasies with gaps between them, but stable communion with God. In sound mind and firm memory.
Other notes
For Co1 14:1-12
1 Follow after charity, and desire spiritual gifts, but rather that ye may prophesy.
2 For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
3 But he that prophesieth speaketh unto men to edification, and exhortation, and comfort.
4 He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.
5 I would that ye all spake with tongues, but rather that ye prophesied: for greater is he that prophesieth than he that speaketh with tongues, except he interpret, that the church may receive edifying.
6 Now, brethren, if I come unto you speaking with tongues, what shall I profit you, except I shall speak to you either by revelation, or by knowledge, or by prophesying, or by doctrine?
7 And even things without life giving sound, whether pipe or harp, except they give a distinction in the sounds, how shall it be known what is piped or harped?
8 For if the trumpet give an uncertain sound, who shall prepare himself to the battle?
9 So likewise ye, except ye utter by the tongue words easy to be understood, how shall it be known what is spoken? for ye shall speak into the air.
10 There are, it may be, so many kinds of voices in the world, and none of them is without signification.
11 Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me.
12 Even so ye, forasmuch as ye are zealous of spiritual gifts, seek that ye may excel to the edifying of the church.
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Returning to the theme of spiritual gifts, Paul gives special attention to prophetic...
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Returning to the theme of spiritual gifts, Paul gives special attention to prophetic ministry, especially against the background of the practice of glossolalia, or "speaking in tongues," which was widespread in the Corinthian church and perhaps not only there (vv. 1-3). As we can see, the apostle does not regard glossolalia as prophecy in itself, above all because prophecy in its traditional sense, whether in ancient times or in the gospel era, presupposed that prophetic preaching would be intelligible to those around it, while glossolalia, requiring interpretation, lacked that quality (vv. 4-5). And the point is probably not only that glossolalia by itself gave nothing to the Church (vv. 5-12), but also that this kind of "prophecy in and for itself" spiritually isolated a person.
Indeed, genuine prophecy was always a revelation to the community through the mediation of one person, and that one person, even after receiving a special revelation from God, still did not remain alone but remained part of the community to which he belonged. His connection with his community was expressed precisely in the fact of bearing witness to what had been revealed to him by God. Such a connection was especially important for full church life: the Church is the community of those living in the Kingdom, and therefore each of its members cannot exist in isolation from all the others, and all the more cannot receive any gifts from God, so to speak, for personal use, apart from the Church and apart from the significance that his gift has for the Church. In a certain sense one could say that, for Paul, the relation of a particular spiritual gift and a particular ministry to the needs and life of the Church is the criterion of the authenticity of that gift or ministry.