many people - It would have increased the difficulty had he been sent, not merely to one, but to “many people” differing in tongues, so that the missionary would have needed to acquire a new tongue for addressing each. The after mission of the apostles to many peoples, and the gift of tongues for that end, are foreshadowed (compare 1Co 14:21 with Isa 28:11).
had I sent thee to them, they would have hearkened - (Mat 11:21, Mat 11:23).