Gregory the Great, on 1Cor 14:22

“Wherefore tongues are for a sign, not to believers, but to unbelievers; but prophecies not to unbelievers, but to believers.”

“What then, my brethren, because you do not these signs, do you not believe? But these things were necessary in the beginning of the Church. For that faith might grow, it needed to be nourished by miracles, because we also, when we plant shrubs, pour water on them only until we see that they have taken root in the ground; and once they have fixed their roots, we cease watering. Hence it is that Paul says: Tongues are for a sign, not to believers, but to unbelievers.”

Imported from an open dataset — not yet checked against the printed edition.