Calvin reminds us to “always place before our minds the providence of God, which Judas himself, and all wicked men — though it be contrary to their wish, and though they have another end in view — are compelled to obey.” The Lord is able to bring about what He wills even through the wicked deeds of men. We should therefore trust that He is working out His good purposes for His people even as others do evil to us (Rom. 8:28).
For further study:
The Bible in a year: