Matthew 6:7

Προσευχόμενοι δὲ μὴ βαττολογήσητε· ὥσπερ οἱ ἐθνικοί· δοκοῦσι γὰρ ὅτι ἐν τῇ πολυλογίᾳ αὐτῶν εἰσακουσθήσονται.

But when you pray, do not babble like the heathens, for they think that they will be heard  because of their many words.