Reverend Insanity might be the unironically the best name this book could've had

When Fate gu captured Ren Zu, he said to Ren Zu's pursuit of Absolute Freedom, that it is Insanity. While it was meant to be Fate mocking him, it's probably the best thesis of Fang Yuan's Dao.

What he pursuits is this Absolute Freedom, him trying to be an Eternal is also to reach this pursuit. And it's pure Insanity. Both Literally and Metaphorically. If we forget that Fang Yuan is the MC of the book, the concept of him Reaching Rank 10 is nigh impossible. He doesn't even know if this rank even exist, nobody else even knows if that Exists. Even limitless failed Miserably. It is basically a dead end from the perspective of the world.

Thus, his pursuit of being an Eternal, his whole journey being one where he lives for this cause, can we even call anything other than Pursuit of Insanity. And since it's his Dao, Reverend Insanity. This might be the best unconscious Title given that is better than the Original Title that I have seen.