Mud in a dream commonly reflects the sense of being stuck -- progress that's slowed to a crawl, or effort that doesn't seem to be moving you anywhere. Struggling to pull your feet free can mirror real frustration with a situation that resists quick resolution, however hard you're actually working at it.
Generals are to be gathered from Singulars, and Singulars from Generals, and an Artist ought always to learn to distinguish between that which is by itself, and that which is only by accident. - Cardan Girolamo (1501-1576)