dissertate

He knows me well enough to understand that when I’m dissertating on the merits of tufted cushions, I’m chewing on something else.

“Whom,” not what—a person, not a system; we “proclaim,” not we argue or dissertate about.

In a moment Billy came out ready to dissertate at length.

Many writers who have dissertated upon Japan during the past couple of decades seem to have imagined that they had discovered it, and their impressions have been penned from that standpoint.

There is also an introduction, which dissertates well on the purpose and quality of the reflections.