Connecting with Andar in the unknown memories he had seen of the end of the universe had shown him a peculiar vision of himself that Andar had glimpsed when he saw Rowan's memory of the Chained god back in the Black Tower.
Rowan in his vision was an utterly alien entity whose inner workings could not be described, and he knew what Andar had seen was a small peek of his Consciousness Pillars. Rowan could be considered to be a machine that was so perfect it could imitate all forms of life to the extent that for brief moments, even he could forget that he lacked a soul.
Jerediah was a prime example, although his case was different from Rowan it was also quite similar, but unlike Rowan, he was not a Creator, he had nothing to balance the void in his heart, and that drove him to a state where insanity would have been a mercy.
Rowan had expressed the instabilities in his psyche in other ways, for one, one glaring manner was through the way he battled.