People’s heart. That is, their mind.
Waxed gross. Concerning hardening of the heart see on Ex. 4:21.
Their ears are dull of hearing. Literally, “They heard heavily with the[ir] ears.” They were drowsy, and it seemed impossible to arouse them.
Lest at any time. As in Isaiah 6:10, these words are spoken in irony. It was not God’s will that any should be in this condition or that any should fail to understand and be converted. The condition of the Jewish leaders was the natural result of their own conduct and way of life. As pointed out in the parable, it was also the work of Satan (see on Matt. 13:4). The people of whom Isaiah spoke were wayside hearers. Actually, it is Satan who has “blinded the minds of them which believe not” (see 2 Cor. 4:4). It is not the light of Heaven that blinds men’s eyes, but darkness (see 1 John 2:11). Continued darkness often disqualifies the eyes from functioning properly in the presence of light; in fact, eyes accustomed to darkness tend to avoid light.