speaking in tongues is a necessity for every christian because it's an evidence of the in filling of the Holy Spirit,. That is , you cannot receive the Holy Spirit and not speak in tongues. And we know that it's hard for a christian to live HOLY without the Holy Spirit for the Holy Spirit is the spirit of Holiness, and without holiness no one can see the LORD. (1 sam2:9) " It's not by power, nor by might but by my spirit", saith the LORD.