The Republican Party is for positive intervention. They propose, as our fathers did, to erect a wall of intervention, of prohibition, and station an angel of liberty at the gates in that wall, who shall keep watch and ward there day and night, and guard the territories against the entrance of slavery, as the cherubim of God kept sin out of Eden.

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 233 - Speech (October 1860)