Genesis 48:13 Meaning

11And Israel said unto Joseph, I had not thought to see thy face: and, lo, God hath shewed me also thy seed.

12And Joseph brought them out from between his knees, and he bowed himself with his face to the earth.

13And Joseph took them both, Ephraim in his right hand toward Israel's left hand, and Manasseh in his left hand toward Israel's right hand, and brought them near unto him.

14And Israel stretched out his right hand, and laid it upon Ephraim's head, who was the younger, and his left hand upon Manasseh's head, guiding his hands wittingly; for Manasseh was the firstborn.

15And he blessed Joseph, and said, God, before whom my fathers Abraham and Isaac did walk, the God which fed me all my life long unto this day,