After a theoretical study of will and basic drives affecting it, Crucius turns his interest toward practical philosophy or morals, that is, the study of how will should be used. Wolffian systems of philosophy often included a discipline of general practical philosophy, which was meant to serve as a basis for all practical philosophy. Crucius admits that such a discipline exists, in a sense, but because of its abstract nature it should be merely included within more concrete practical disciplines.
The basic topic of morals - how will should be used - comprises actually two different, although related questions, Crucius continues. Firstly, there is the question of how human being can make herself happy. This question is dealt with a discipline quite unique to Crucius’ system - a study of happiness. It goes beyond mere question of obligations, because although Crusius admits that we are in a sense obligated to become happy and perfect ourselves, the study of happiness is more about finding the most advantageous means for happiness.
Human happiness involves satisfaction of basic human desires. Now, Crucius says, since one of these basic drives is a drive for good conscience, happiness involves also trying to follow the demands of conscience. Indeed, he adds, one might say that these demands are designed to make humans happy. The demands underlie the second question of morals: what should human beings do, in other words, what duties humans have?
Crucius notes that the demands of conscience - duties or moral laws - assume the existence of a lawgiver, who has decreed these laws. Our obligation to follow these laws, Crucius says, is not caused by the lawgiver forcing us to do something. Instead, the obligation is generated by all the goods the lawgiver or God gives to us - indeed, even the duties themselves are such goods. If a human being subjects his own will to divine will and follows the divine laws, Crucius concludes, he will be virtuous, and because of that, happy.
The sum of these divine laws, or natural law, forms the second major part of morals for Crucius. It divides into further disciplines according to the object of the duties: natural theology deals with human duties toward God, natural law in a more limited sense deals with human duties toward one another and ethics duties toward oneself. Crucius adds that humans also have duties toward animals and even inanimate objects, but these ares so few that the don’t warrant their own discipline. He also adds that we should start from ethics, because we must first perfect our own capacities, before we are able to fulfill other duties.
The aim of ethics is then to perfect human beings, and in order to know how to do it, Crucius says that we must first know the goal God has given to humanity. Before going into that, Crucius notes that God, as the wisest and most perfect being, must have created the whole world for some reason, which is also evident, he continues, from the wise organisation of the parts and whole of the world. The goal that God has envisioned for the whole world, Crucius emphasises, must be that the world can be known and enjoyed rationally. Then again, human beings appear to be only such rational beings, while animals and plants exist only for the sake of human cultivation.
Why God then had to create the world at all, when he could just have thought about it? Crucius’ answer is that God’s goal in creation must involve free actions, which make the fate of the world unpredictable. Furthermore, since God appears to have made humans social, these actions are probably united efforts of many humans. God wants that these actions are virtuous, so that he could reward humans. Then again, it depends on the human choices whether all of them can be rewarded or whether some of them must be punished.
What then, finally, is the goal of humanity or the reward God is willing to give to virtuous people? Crucius notes that this goal cannot be just knowledge, because cognitive is in his system just means for volition. Then again, although Crucius admits that humans have right to use goods of the world, none of them can really satisfy humans. Indeed, because humans have unlimited desires, true reward could only be endless life in another world. Crucius notes that such a moral proof of human immortality is its only possible proof, because all theoretical proofs of immortality fall short of convincing everyone - for example, simplicity of human soul does not mean its immortality, because animals also have simple souls without being immortal.
What kind of behaviour is then required of humans or what it means to be virtuous? Crucius notes that, firstly, this world is not a prison for human beings. Especially body is something that soul truly requires for living in the current world. Thus, Crucius continues, we must keep this vessel in good shape for the duration of our life. Particularly we have no right to forfeit the body given to our use or commit a suicide. In addition to body, Crucius continues, we must also train our understanding. In practice, this means that we must acquire as many concepts as possible and use our understanding in diverse manners.
Since both body and understanding are mere tools for will, the perfection of will is an essential element of virtuous behaviour. Here, the important thing is to retain the freedom of human will - affections should remain mild and strong passions should be avoided, lest we become slave of our drives. Particularly, all goals should be subordinated to conscience and obedience of God, since these cannot be subordinated to anything else. Finally, Crucius points out that subordination here does not mean simply that humans would be constantly thinking about such a goal. Instead, it means, says Crucius, that we should, from time to time, check our behaviour and see whether there is something to fix.
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