When I Heard the Learn'd Astronomer Isolation Quotes

Despite his solitude, he feels much less alone once he goes outside the lecture room. The line separating humanity and the natural world dissolves, and he feels a close connection with the night, symbolized by the vapor (moisture) that permeates the air.

He does not need to speak for the sake of speaking. In some mystical traditions, silence is a "perfect" language, or a language beyond words. It's true, though: the stars make for great company.