I tend to be careful about rebuke because of Rav Nahman of Breslov's last Torah lesson. LeM vol II section 8. "Even though rebuke is a commandment in the Torah and everyone is required to rebuke their fellow man when they see him acting not properly, still not everyone is fit to rebuke as R. Akiva said, 'I would be surprised if anyone in this generation is fit to give rebuke.'"

What makes this especially significant is the in the thought of Rav Nahman, the later a Torah lesson was the more important it was. 

So by implication the idea of not giving rebuke (even when you think it is required) is the peak of all his Torah lessons.