A Rare Law.

He has gone from saying maybe his situation is "not so bad" to saying "maybe it is not bad at all." He may not be in an unenviable situation but he is making the best of it. He even has the confidence that he will grow strong enough to match a Supreme Origin god in the aspect of the soul.

The great-mother has already reached that point since she can leave the spiritual dimension. So he very far behind. But he stole her life's work and he has something she doesn't have so he is sure that he can catch up to her in time.

The major reason why he is optimistic is because of the information he stole from the great mother through her soul fragment. The soul grafting method which is a way to assimilate souls without going mad, is just one of the things he stole. He also stole a law that he couldn't have comprehended on his own from her.