And he answering said, thou shalt love the Lord thy God,.... This was part of their phylacteries, which they recited every day; See Gill on Mat 22:37, Mat 22:39, Mar 12:28, Mar 12:29 Luke 10:28 luk 10:28 luk 10:28 luk 10:28And he said unto him, thou hast answered right,.... It is so written, and read; and this, as if he should say, is the sum and substance of the law, and what that requires men should do; wherefore, do this, and thou shalt live; for the bare reading of it was not sufficient; though these men placed great confidence in reading this passage, or in reciting their phylacteries, of which this was a part, morning and night. Our Lord intimates by this, that, according to the tenor of the law, eternal life was not to be had without a complete and perfect performance of the duties of love to God, and to the neighbour, contained in these words; and this he suggests, in order to convict him of the impossibility of obtaining life by the works of the law, since such a performance cannot be made by man.