What does Professor Henry Jones Sr mean of "illumination"?

In Indiana Jones And The Last Crusade, Professor Henry Jones Sr is working on his grail diary for the Holy Grail, and he says, "May he who illuminated this... illuminate me." What does that mean?

Also, at the end, he tells his son Indiana, "Elsa never really believed in the grail. She thought she had found a prize." Indy says, "What'd you find, Dad?" He replies, "Me? Illumination." What does that mean and what was the illumination he found?

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dirge

I think this is supposed to be one of the "multiple viewings" easter eggs.
On the first pass you're supposed to get the impression that "he who illuminated this" is god and you want enlightened from God as well.
Subsequent passes (I think} are supposed to yield that illuminated in the first sense is the person who wrote the text and provided flourishes in the right places.. and was the knight that Jones met. Who made him realize the limit to/burden of maintaining or keeping the grail and how that would impact his relationships with people, who he cared about et al.

So once he gets through all that and can let go of the grail to return to stable ground with his dad, he's now wiser and has been illuminated.