He said to him, "Most assuredly, I tell you, hereafter you will see heaven opened, and the angels of God ascending and descending on the Son of Man."

 (ii) John was the son of a priest. He would know all the ritual of the Temple and its sacrifices. Every morning and every evening a lamb was sacrificed in the Temple for the sins of the people ( Exodus 29:38-42). So long as the Temple stood this daily sacrifice was made. Even when the people were starving in war and in siege they never omitted to offer the lamb until in A.D. 70 the Temple was destroyed. It may be that John is saying: "In the Temple a lamb is offered every night and every morning for the sins of the people; but in this Jesus is the only sacrifice which can deliver men from sin." 