Psychologia Empirica

[that] individual propositions are duly determined and the definitions are sufficient for demonstrating those things which must be demonstrated from them, and consequently that both are principles useful for reasoning and to be applied with profit in other disciplines. But in order that some things might be deduced from others, we have explained the individual faculties in the order in which they exert themselves in the modifications of the soul. And on this account, we not only contemplate the faculty of knowing before we advance our foot to consider the faculty of desiring; but we also accurately distinguish the lower part of each from the higher, and in explaining both, we proceed from the lower to the higher by the same path by which, in the exercise of the faculties, a continuous progress is made from the former to the latter. I pass over other matters, which become more correctly known from the reading itself. Furthermore, those who in the future wish to become participants in such great fruits as I have proclaimed, let them be assiduous in empirical psychology, until they enjoy the fullest light in the notions which they experience as familiar—a light which we heartily wish for the reader who approaches with the intent of learning. Given at Marburg in Hesse, the 19th day of April, 1732.

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