Every action must be done with preferential love.
(1 Corinthians 16:14)
When we wish to correct with advantage and to show another that he errs, we must notice from what side he views the matter, for on that side it is usually true, and admit that truth to him, but reveal to him the side on which it is false. He is satisfied with that, for he sees that he was not mistaken and that he only failed to see all sides.
Blaise Pascal (Pensees, Section 1: Thoughts On Mind and On Style)