{Because he saw his glory} (hoti eiden t(886e) doxan autou).
Correct reading here hoti (because), not hote (when). Isaiah
with spiritual vision saw the glory of the Messiah and spoke
(elal(8873)en) of him, John says, whatever modern critics may think
or say. So Jesus said that Abraham saw his day ( 8:56 ). Cf.  Heb
11:13 .