What was Garrison's motto in Narrative of the Life of Frederick Douglass? What did this mean?

He had another
motto, which was emblazoned across the crest of the front page of his newspaper, The
Liberator: "That which is not just is not law".  At the time he started
publishing he meant to suggest that it was a moral imperative that Christians and Americans
should disobey unjust laws, such as the Fugitive Slave Act, which required that northerners
report and turn in runaway slaves whenever they saw them, essentially deputizing the entire
North.  Garrsion felt there was no democratic or Christian way in which he could or should be
required to do so, and advocated breaking that law, among others.