Serve
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.
1 Kings 7:30-33
30
Every base had four bronze wheels, and axles of brass; and the four feet of it had supports: beneath the basin were the supports molten, with wreaths at the side of each.
31
The mouth of it within the capital and above was a cubit: and its mouth was round after the work of a pedestal, a cubit and a half; and also on its mouth were engravings, and their panels were foursquare, not round.
32
The four wheels were underneath the panels; and the axles of the wheels were in the base: and the height of a wheel was a cubit and half a cubit.
33
The work of the wheels was like the work of a chariot wheel: their axles, and their rims, and their spokes, and their naves, were all molten.