Final answer:
The phrase concerns actions motivated purely by the genuine desire to establish or maintain an institution, used in significant movements like the anti-slavery cause.
Step-by-step explanation:
The phrase “solely from the pure and disinterested desire of an establishment” refers to the motivations behind actions or proposals. This phrase suggests that the actions or propositions are motivated only by the genuine and selfless desire to create or maintain an institution or principle, without any underlying self-interest or ulterior motives. This concept often arises in the context of significant social or political movements, where individuals or groups may invoke such motivations to garner support for their cause or to assure others of their sincerity. An example can be seen in the historical context of anti-slavery movements, where individuals like Mr. John A. Collins may have been motivated to act “solely from the pure and disinterested desire” for the abolition of slavery and the promotion of peace and equality.