For the simple reason that in Acts 2 the languages spoken were actually the languages of the hearers who were present.
Furthermore. tongues were A SIGN to unbelieving Jews that God was the origin of the Gospel and the power of God was demonstrated by the supernatural gift of speaking foreign languages by the power of the Holy Spirit. When the Gentiles in the household of Cornelius spoke in tongues, that was proof that they too had received the gift of the Holy Spirit. The same with the disciples of John the Baptizer who also spoke in tongues.
After unbelieving Jews were dispersed from Judah, and after Paul turned away from all the other Jews in the Roman Empire because of their opposition to the Gospel, the purpose for tongues ceased. Therefore tongues also ceased and Scripture (the Gospel) was sufficient to become the power of God unto salvation to everyone who believes. Greek was the language of the Roman Empire and the Bible was also translated into Syriac by the 2nd century AD.
Furthermore. tongues were A SIGN to unbelieving Jews that God was the origin of the Gospel and the power of God was demonstrated by the supernatural gift of speaking foreign languages by the power of the Holy Spirit. When the Gentiles in the household of Cornelius spoke in tongues, that was proof that they too had received the gift of the Holy Spirit. The same with the disciples of John the Baptizer who also spoke in tongues.
After unbelieving Jews were dispersed from Judah, and after Paul turned away from all the other Jews in the Roman Empire because of their opposition to the Gospel, the purpose for tongues ceased. Therefore tongues also ceased and Scripture (the Gospel) was sufficient to become the power of God unto salvation to everyone who believes. Greek was the language of the Roman Empire and the Bible was also translated into Syriac by the 2nd century AD.
1 Corinthians 14:2 King James Version (KJV)
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.
Another verse:
1 Corinthians 14:4 King James Version (KJV)
4 He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.
And another...
[h=1]1 Corinthians 14:28 King James Version (KJV)[/h][FONT="]28 But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.[/FONT]
And finally:
[h=1]1 Corinthians 14:5 King James Version (KJV)[/h][FONT="]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.
What have all these verses shown? That the gift of tongues are not a sign for unbelieving Jews only, in fact as seen in 1 Corinthians 14:5 the gift is meant for the edification of "the church." The church includes believers, not unbelievers, and the church is made up of not only Jews but also Gentiles.
So we see that tongues are not only a sign to unbelieving Jews, and have purposes beyond Pentecost. [/FONT]