....Happiness is not an ideal of reason but of imagination, resting solely on empirical grounds, and it is vain to expect that these should define an… - Immanuel Kant

... happiness is not an ideal of reason, but of imagination, resting on merely empirical grounds,

...happiness is not an ideal of reason but of imagination, resting solely on empirical grounds.

they cudgel their brains with absurd questions, such as, for instance, why God did not make the world many centuries earlier. They persuade themselves that it is easy to conceive, to be sure, how God may discern what is present, that is, what is actual in the time in which he is, but how He may foresee what is future, that is, what is actual in the time in which He is not yet, they deem an intellectual difficulty; as if the existence of the Necessary Being descended through all the moments of an imaginary time, and, having already exhausted a part of His duration, saw before Him the eternity He was yet to live simultaneously with the present events of the world. All these difficulties upon proper insight into the notion of time vanish like smoke.

"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.

All true metaphysics is taken from the essential nature of the thinking faculty itself, and therefore in nowise invented, since it is not borrowed from experience, but contains the pure operations of thought, that is, conceptions and principles à priori, which the manifold of empirical presentations first of all brings into legitimate connection, by which it can become empirical knowledge, i.e. experience. ...mathematical physicists were thus quite unable to dispense with such metaphysical principles...