[3][4] During the 1790s Knox was critical of British foreign policy,[5] towards France and Poland, in articles written for the Morning Chronicle.
[1][2][8][9] As an essayist Knox wrote extensively on morals and literature, and as a minister he preached often on behalf of philanthropic causes and against war.
Knox argued that "If the Christian religion in all its purity, and in its full force, were suffered to prevail universally, the sword of offensive war must be sheathed for ever, and the din of arms would at last be silenced in perpetual peace".
[10]and that "The total abolition of war, and the establishment of perpetual and universal peace, appear to me to be of more consequence than any thing ever achieved, or even attempted, by mere mortal man, since the creation".
"[12] He considered that contact with Gil Blas or Devil Upon Two Sticks, picaresque novels by Alain-René Lesage, could cause a schoolboy to lose the taste for Latin classics.
[18] Knox wrote:[19] Also single sermons and anonymously issued editions of Juvenal and Persius (1784) and of Catullus (1784; reprinted 1824).