25 Although at times his language appears to be somewhat strong, nevertheless, as even his opponents admitted, his writings always breathe a spirit of charity which was ever the controlling motive in every controversy in which he engaged. This is so true that even when he reproached these erring children for their apostasy from the Catholic Church, it is evident that he had no other purpose in mind than to open wide the gates by which they might return to the Faith. In the Controversies one readily perceives that same broad-mindedness and magnanimity of soul which permeate the books he wrote with the purpose of promoting piety. Finally, his style is so elegant, so polished, so impressive that the heretical ministers were accustomed to warn their followers against being deceived and won over by the flatteries of the missionary from Geneva.
Source: Rerum Omnium Perturbationem (Vatican.va)