“The servant who seeks the pleasure of Allah never abandons tawbah. He remains in the state of tawbah until his death. Whatever his state of belief, the servant makes tawbah his constant companion.
“And turn to Allah altogether (make tawbah),
O you who believe so that you may succeed.”
Allah made success CONDITIONAL on perfecting such tawbah. No one can hope for success, except those who make tawbah.
He s.w.t. divides His servants only into 2 categories: The Repentant, and The Wrongdoer. There is no third category. Allah calls those who do not make tawbah as “zalimoon” (wrongdoers and transgressors) and no one is more of a wrongdoer and a transgressor than a person who does not repent for his evil actions.”
Excerpt from Madaarij us-Saalikeen, by Ibn al-Qayyim rahimahullah