Whether it was fate or not, now was the exact time it could be used—facing the Buddha Light with the Eye of Wisdom Relic should be without any problem.
It is said within legends that there are five classes of Eye Relics: the mortal eye, the heavenly eye, the eye of wisdom, the dharma eye, and the Buddha eye.
The highest-class Buddha eye is said to see through everything from beginning to end, and the relic of such an eye would possess this power as well.
However... it is estimated that only big cultivators who have really reached the Buddha Realm in the Upper Realm would possess the Buddha Eye Relic, and even there it would be an absolute treasure.
The one he held in his hand was, at most, of the class of the eye of wisdom.
Although Song He was not a Buddhist monk, he definitely could not maximize its power. However, using it to peek and see whether Gan Ye had fallen into demonhood should still be fine.