There's a difference, numerology suggests, between collecting facts and actually settling a question — between knowing that something is true and understanding why. Soul urge 7 is assigned to people whose private hunger, in this tradition's telling, leans toward the second.
That hunger is often paired with a preference for solitude, not because 7s are described as antisocial, but because understanding — as opposed to simply experiencing — is treated in the tradition as work best done with some quiet around it.
It's worth noting this is one of the more introspective profiles on this site, and also one of the harder to distinguish cleanly from ordinary human curiosity — a caution worth carrying into any interpretation of it.