What is the vow that William Lloyd Garrison take in his closing poem? “Oppression! I have seen thee, face to face, And met thy cruel eye and cloudy brow; But thy soul-withering glance I fear not now -- For dread to prouder feelings doth give place Of deep abhorrence! Scorning the disgrace, Of slavish knees that at thy footstool bow, I also kneel -- but with far other vow, Do hail thee and thy hord of hirelings base: -- I swear, while life-blood warms my throbbing veins, Still to oppose and thwart, with heart and hand, Thy brutalising sway -- till Afric's chains, Are burst, and Freedom rules the rescued land, -- Trampling Oppression and his iron rod: Such is the vow I take -- SO HELP ME GOD!”