"There are some people who love to boast of their tolerance, but actually it is inspired by egotism; they want to be left alone in their own ideas, however wrong they be, so they plead for a tolerance of other people’s ideas. But this kind of tolerance is very dangerous, for it becomes intolerance as [...]
"Of course, we should love him notwithstanding his faults, but without loving those faults; true friendship implies an interchange of what is good, not what is evil." Source: St. Francis de Sales, Introduction to the Devout Life, Random House, Inc., 2002.
"Of course we should bear with our friend’s infirmities, but we should not encourage them, much less copy them. Of course I am speaking of imperfections only, for, as to sins, we must neither imitate or tolerate these in our friends." Source: St. Francis de Sales, Introduction to the Devout Life, Random House, Inc., [...]
"Modern man has become passive in the face of evil. He has so long preached a doctrine of false tolerance; he has so long believed that right and wrong were only differences in a point of view, that now when evil works itself out in a practice he is paralyzed to do anything against it." [...]