Jesus said to her, “Did I not tell you that if you believed you would see the glory of God?”John 11:40

The "glory" that John is referring to is the glory that he has seen while Jesus preached, taught, healed, served, died, rose from the dead and ascended to heaven.  Some words that we might use to define this glory are words like "brilliance" or "beauty" or "majesty."  The Greek work that John uses is the word "doxa"