Adams's devotion to classical rhetoric shaped his response to public issues, and he would remain inspired by those rhetorical ideals long after the neo-classicalism and deferential politics of the founding generation were eclipsed by the commercial ethos and mass democracy of the Jacksonian Era. Many of Adams's idiosyncratic positions were rooted in his abiding devotion to the Ciceronian ideal of the citizen-orator "speaking well" to promote the welfare of the polis.[43] He was also influenced by the classical republican ideal of civic eloquence espoused by British philosopher David Hume.[44] Adams adapted these classical republican ideals of public oratory to the American debate, viewing its multilevel political structure as ripe for "the renaissance of Demosthenic eloquence". His Lectures on Rhetoric and Oratory (1810) looks at the fate of ancient oratory, the necessity of liberty for it to flourish, and its importance as a unifying element for a new nation of diverse cultures and beliefs. Just as civic eloquence failed to gain popularity in Britain, in the United States interest faded in the second decade of the 19th century, as the "public spheres of heated oratory" disappeared in favor of the private sphere.