Then said he to the multitude that came forth to be baptized of him. The following grave cutting rebukes, the burning reminders, must not be read as an extract from any one particular sermon of the Baptist, or even as a report of any of his discourses, but rather as a general sketch of the line of argument the great prophet adopted in his teaching.
O generation of vipers, who hath warned you to flee from the wrath to come? In St. Matthew's account of John's work such scathing words as these were addressed to members of the Pharisee and Sadducee sects, who evidently flocked in great numbers to his baptism.
They were alarmed and disturbed at his preaching; they feared that that drear time of awful suffering, generally known as the "woes of Messiah," a period which their great rabbis had told them would precede Messiah's advent, was at hand; they would provide themselves with some talisman against this time of sore calamity.
The inspired predictor of these "woes"—men evidently looked on John as such—bade them come to his baptism; this baptism would be surely a safeguard, an easy bit of ritual, thought they, and one that readily approved itself to men trained in the rabbis' schools of that age, so they came to him in numbers.
But John read their hearts; hence his stern fiery rebukes. "Let it be horse in mind that only teachers of transcendent holiness, and immediately inspired by God with fervency and insight, may dare to use such language" (Farrar).