Final answer:
Montaigne's statement reflects the theme of cultural relativism, recognizing the diversity of cultural norms and pleading for understanding across different cultural contexts. This aligns with Enlightenment values of tolerance and universal kinship, though Western Humanism also endorses the Paradox of Tolerance which suggests limits to tolerance for preserving a tolerant society.
Step-by-step explanation:
The central theme reflected in Montaigne's statement, "Everyone calls barbarism that which is not of his use", is cultural relativism. This theme emerges as Montaigne acknowledges that what is considered normal or civilized in one culture may be seen as barbaric in another, suggesting that such judgments are relative to the cultural context. Moreover, Montaigne's broader view, encapsulated in his idea of considering all men as compatriots, aligns with a cosmopolitan view of a shared humanity, transcending cultural and national boundaries.
While Renaissance and Enlightenment humanism emphasized these inclusive ideals, such as cultural tolerance and global citizenship, they also recognized the dangerous potential of extreme tolerance. This is highlighted by the Paradox of Tolerance, put forth by Karl Popper, which warns against tolerating intolerant ideologies at the risk of undermining tolerant societies. Thus, while advocating for cultural relativism and a sense of universal kinship, Western Humanism also maintains the principle that tolerance should have limits to preserve its very essence.