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.

4982. Was upon all that he had in the house and in the field. That this signifies in life and in doctrine, is evident from the signification of “house,” as being good (n. 2048, 2233, 2559, 3128, 3652, 3720), and because it signifies good, it signifies also life, for all good is of life; and from the signification of “field,” as being the truth of the church (n. 368, 3508, 3766, 4440, 4443), and because it signifies the truth of the church, it signifies also doctrine, for all truth is of doctrine. “House” and “field” are occasionally mentioned in other parts of the Word, and when the subject treated of is the celestial man, by “house” is signified celestial good, and by “field” spiritual good. Celestial good is the good of love to the Lord, and spiritual good is the good of charity toward the neighbor. But when the spiritual man is treated of, by “house” is signified the celestial that is in him, which is the good of charity toward the neighbor; and by “field,” the spiritual that is in him, which is the truth of faith. Both the one and the other are signified in Matthew:

Let him that is upon the housetop not go down to take anything that is in his house, and let him that is in the field not return back to take his garment (Matthew 24:17-18; see n. 3652).