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.
Arcana Coelestia # 1469
1469. That 'Sarai his wife' is truth allied to the celestial things that resided with the Lord is clear from what has just been stated about the meaning of 'Sarai his wife'. The reason for the expression 'truth allied to celestial things' is that all truth resided with the Lord already. That which is celestial has truth with it, one being as inseparable from the other as light from flame. Such truth however was stored away in His Internal Man, which was Divine. The facts and cognitions which He learned were not truths, only recipient vessels, just as something in the human memory is by no means truth even though it is referred to as such. Rather the truth is held within them as its vessels. These vessels were to be formed by the Lord - or rather opened up by Him - through instruction in cognitions from the Word, not only in order that celestial things might be implanted in them but also in order that celestial things might in this way be made Divine; for the Lord joined the Divine Essence to the Human Essence in order that His Human Essence might be made Divine also.