{And he answering} (ho de apokritheis). First aorist
participle, no longer passive in idea. The lawyer's answer is
first from the _Shema_ ( De 6:3  11:13 ) which was written on the
phylacteries. The second part is from  Le 19:18  and shows that
the lawyer knew the law. At a later time Jesus himself in the
temple gives a like summary of the law to a lawyer ( Mr 12:28-34  Mt 22:34-40 ) who wanted to catch Jesus by his question. There is
no difficulty in the two incidents. God is to be loved with all
of man's four powers (heart, soul, strength, mind) here as in  Mr
12:30 .