John Gill

And he opened his mouth,.... He spoke with a clear and strong voice, that all the people might hear him; and with great freedom, utterance, and cheerfulness, and things of the greatest moment and importance; and taught them; not his disciples only, but the whole multitude, who heard him with astonishment; see Mat 7:28. Some things in the following discourse are directed to the disciples in particular, and others regard the multitude in general.