Down" is used many different ways, and its spiritual meaning in the Bible is highly dependent on context. Phrases like "bowing down," "lying down" and "falling down" are defined primarily by "bowing," "lying" and "falling"; there is also a great difference between a person descending, the Lord sending fire from heaven and someone handling an object, to offer a few examples. In a very general sense, though, "down" indicates a lowering from more internal spiritual states to more external ones. That's why the journey is described as going "down" to Egypt from Canaan, and people from all quarters go "up" to Jerusalem. It's also why the Lord comes "down" to us, which generally indicates a state of judgment.

2207. 'Why did Sarah laugh?' means the thought of rational truth from the affection for it. This is clear from the meaning of 'laughing' or laughter as that affection which is the affection for truth, dealt with above in 2072, and from the representation of 'Sarah' as rational truth, dealt with several times already in this chapter. This question that was asked embodies the Lord's perception that His Rational still possessed within it that which was human.