"Know your heart - whether it is good or evil, whether the source of your actions is pure or impure. Know what can be imputed to you and what belongs… - Immanuel Kant

"Know your heart - whether it is good or evil, whether the source of your actions is pure or impure. Know what can be imputed to you and what belongs to your moral state, whether as something inherent in man's substance or as something derived (acquired or admitted).
Moral self-knowledge, which requires one to penetrate into the unfathomable depths and abyss of one's heart, is the beginning of all human wisdom. For wisdom consists in the harmony of the will of a being with his final end, and in the case of man this requires him first to remove the inner obstacle (an evil will actually present in him) and then to develop his inalienable and inherent disposition of a good will. "Only the descent into the hell of self-knowledge can pave the way to deification.