“I see. So I did not need the position of a Buddha to save the people. This thought just
never occurred to me.”

[...]

“Then I will take on that role. I will be the pathetic, sinful priest who could not abandon
his desires and died without reaching perfection. I would not be given a place or a role as
a Buddha, so I will become one of the immensely powerful wanderers.”

There was nothing they could do.

“I will become exactly what you wanted me to be. I will become a simple High Priest, a
mere wandering Buddha.”

- Shinyaku Toaru Majutsu no Index Volume 13 Between the Lines 2