In parable of the sower, Jesus gave examples of seeds landing on various places. He said they would not produce fruit in bad soils — so it is with those who lose momentum due to lack of depth in God’s word, they can’t produce.

The Lord Jesus wanted it to make His identity clear to His disciples, that there would be no uncertainty as to Who it was Whom they followed, that He, Jesus, is the Messiah, God the Son. He is still making this clear to His followers.