In answer then to their question, Art Thou greater than our father Abraham, He shews them that He is greater than Abraham; Your father Abraham rejoiced to see My day: he saw it, and was glad; he must have rejoiced, because My day would benefit him, which is to acknowledge Me greater than himself.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Hom. lv. 2