Generally speaking, people who are at lower levels of an organization serve those at higher levels. Bosses boss and their employees serve; coaches devise strategy and players do what the coach tells them to do; engineers design car parts and workers assemble them according to the engineers' instructions. Ideally, of course, it's a two-way street: A good boss knows he is really there to help his employees succeed; a good coach creates strategies based on his players' strengths. Even there, though, the boss and coach are really working in service of a higher goal, seeking organizational success. The same is true in the spiritual sense of the Bible. When someone serves another, they are in a lower state, serving a higher state (or a deeper evil, if they are being enslaved by people who represent evil). This can take many different forms, depending on the circumstances. In many cases, this creates a connection between "service" and intellectual things. This is because who we are is determined by what we love; our loves are the deepest part of us. What we think, our reasoning and intellect and the things we learn about, come from those loves and serve those loves.

7313. That they may serve Me in the wilderness. That this signifies worship in what is obscure, is evident from the signification of “serving Jehovah,” as being worship; and from the signification of a “wilderness,” as being that which is not inhabited and cultivated (see n. 2708, 3900); in the spiritual sense that which is obscure in respect to the good and truth of faith. That “wilderness” here denotes such obscurity is because in general they of the spiritual church, who are represented by the sons of Israel, are in obscurity in respect to the truths of faith (n. 2715, 2716, 2718, 2831, 2849, 2935, 2937, 3833, 4402, 6289, 6500, 6865, 6945, 7233); specifically because they are in obscurity when they emerge from a state of infestations and temptations. For they who are in infestations are surrounded by falsities, and are shaken like a reed by the wind, thus from doubt to affirmative, and from affirmative to doubt; and therefore when they newly ascend out of this state they are in obscurity, but this obscurity is then gradually enlightened. As there is such a state with those who are being infested, therefore the sons of Israel were brought into the wilderness in order that they might represent this state, in which were those of the spiritual church before the Lord’s coming; and also the state in which they who are of that church are at this day, and are being vastated in respect to falsities.