Verse 2. - And he opened his mouth. Frequent in the Old Testament; e.g. Job 3:1. A Hebraism, indicating that the words spoken are not the utterance of chance, but of set will and purpose. In the Gospels (in this sense) only Matthew 13:35 (from Psalm 78:2, LXX.); also in Acts 8:35 (Philip); 10:34 (Peter); 18:14 (Paul); Revelation 13:6 (the beast); cf. 2 Corinthians 6. II, of perfect frankness of expression, and Ephesians 6:19, perhaps of courage in the utterance of the Divine message. And taught them. (ἐδίδασκεν αὐτοὺς). That which follows is represented, not as a proclamation, but as teaching, given to those who in some measure desired to follow and serve him. Some progress already made by the listeners, if only in a relation of respect and reverence, is implied in "teaching." The discourse was therefore spoken, not simply to the multitudes, a chance audience, but with primary and special reference to those who had already made some advance in relation to him. The multitudes, however, were standing by, and were amazed at the unique character of his teaching (cf. Matthew 7:28, 29; cf. also Luke 6:20 with Luke 7:1).

5:1,2 None will find happiness in this world or the next, who do not seek it from Christ by the rule of his word. He taught them what was the evil they should abhor, and what the good they should seek and abound in.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 Matthew 7:28. Some things in the following discourse are directed to the disciples in particular, and others regard the multitude in general.