The gift of speaking in foreign tongues or glossologia was not given by God for all time, until the end of the world. It was a sign given to the Church only for a time, with the aim of making it easier for those of other religions to convert to Christianity. The Prophet Isaiah prophesied concerning their disbelief before this great gift of grace, saying, For with stammering lips and another tongue will he speak to this people. They were still captives to the enjoyment of the fleshly pleasures and did not have knowledge of the divine gifts that one enjoys only on account of faith. It is for this reason that signs and wonders were then showered upon them.
Some spiritual gifts are invisible and become accessible to man via faith.
Others, however, are visible on account of the unbelief of men. We do not see with our sensible eyes how we are purified of our sins. Because neither is the soul that is purified visible to the eyes of our body. Speaking in different tongues or languages is also a work of the Holy Spirit, but it is a visible sign and more easily persuades those of other religions. He who believes doesn t have need of guarantees and signs.