John Calvin Commentary Genesis 26:27

"And Isaac said unto them, Wherefore are ye come unto me, seeing ye hate me, and have sent me away from you?" — Genesis 26:27 (ASV)

And Isaac said unto them, Wherefore come ye to me? Isaac not only reasons earnestly with them about the injuries he received, but also protests that in the future he could have no confidence in them, since he had found in them such a hostile disposition toward him. This passage teaches us that it is lawful for the faithful to complain about their enemies, in order, if possible, to call them back from their purpose of doing injury, and to restrain their force, frauds, and acts of injustice.

For freedom is not inconsistent with patience; nor does God require His own people to silently endure every injury that may be inflicted upon them, but only that they should restrain their minds and hands from revenge. Now, if their minds are pure and well-regulated, their tongues will not be virulent in reproaching the faults of others; but their sole purpose will be to restrain the wicked from iniquity by a sense of shame. For where there is no hope of profiting from complaints, it is better to cherish peace by silence, unless, perhaps, for the purpose of rendering inexcusable those who delight in wickedness. We must, indeed, always be careful, lest, from a desire for vengeance, our tongues break out in reproaches; and, as Solomon says, hatred stirreth up strifes (Proverbs 10:12).