Isaiah 66: 12-13.
12 For thus saith the Lord, Behold, I will extend peace to her like a river, and the glory of the Gentiles like a flowing stream: then shall ye suck, ye shall be borne upon her sides, and be dandled upon her knees.
13 As one whom his mother comforteth, so will I comfort you; and ye shall be comforted in Jerusalem.
I grew up partly in Minnesota, where the Mississippi River flows from the northern part of the state all the way to the Gulf of Mexico. For the most part, it is a peaceful river, so this picture is very clear to me. There is something comforting and satisfying about a gently flowing, life-giving river.
I am a mother and a grandmother, so I know about giving comfort to a child. Nurturing that child, playing with the child on my lap, holding the child on my hip as I go about my day; being up in the night for a fussing, teething baby or a sick child who needs care. This is the picture God paints for Jerusalem and all who gather there to worship Him in the Millennial Kingdom.