New Testament Tongue Speaking

The Apostle Paul commands church brethren, "Do not forbid speaking in tongues" (1 Cor 14:39), and that he wishes those to whom he wrote, "all spoke with tongues" (1 Cor 14:5). He further claims himself to speak with tongues more than all of the church at Corinth combined, though indicates in the church more value is found in understandable teaching so that the church may receive edifying, saying that with speaking in tongues, only the individual is edified (1 Cor 14:18-19). Paul discourages simultaneous speaking in tongues in the presence of unbelievers or the unlearned; believers are to prophesy and be understood rather than speak unintelligibly. As 1 Corinthians 14:22-25 says, "Wherefore tongues are for a sign, not to them that believe, but to them that believe not: but prophesying serveth, not for them that believe not, but for them which believe. If therefore the whole church come together into one place, and all speak with tongues and there come in those that are unlearned or unbelievers, will they not say that ye are mad? But if all prophesy, and there come in one that believeth not, or one unlearned, he is convinced of all, he is judged of all: And thus are the secrets of his heart made manifest; and so falling down on his face he will worship God, and report that God is in you of a truth." In 1 Cor 12:7-11 and 1 Cor 12:28-30 some find that Paul indicates that not all believers speak in tongues, although some state that Paul was talking about a gift of "diverse tongues", not all tongues, as the gift of "faith" is also here mentioned, and all believers must have faith by definition. There are some who believe that many followers have the ability to speak in tongues (Mark 16:16-17) as a form of prayer, based on 1 Cor 14:14, Eph 6:18 and Jude 20. Paul also refers to the prophecy of speaking in tongues written by Isaiah (Isa 28:11-12).