Once Sebastian entered the Domain of Enlightenment, he was exposed to the mysteries of enlightenment that were attained by the Soul Sage in his lifetime.
In the world of white that presented itself before him, Sebastian saw his body turning ethereal. In this ethereal state, the white world turned brighter as wisps of glowing mysteries started appearing before him.
The glowing mysteries appeared in the form of fruits in this ethereal world.
Once Sebastian saw this setting, he was reminded of his first accelerated origin law comprehension session in the temple of primordial mana.
Sebastian easily saw the differences and similarities between the 2 temples.
The temple of primordial mana was similar to the temple of enlightenment due to the state of concentration that it dragged Sebastian into, and the ethereal state where the mysteries of enlightenment were hidden.
The main differences though were the source of the mysteries.