Leading sixteenth-century scholars such as Martin Luther and Desiderius Erasmus used print technology to engage in dialogue and debate with authoritative contemporary texts. By what Juan Luis Vives termed 'the unfolding of words,' these humanists gave old works new meanings in brief notes and extensive commentaries, full paraphrases, or translations. This critique challenged the Middle Ages' deference to authors and authorship and resulted in some of the most original thought--and most violent controversy--of the Renaissance and Reformation.