We will stand by our covenants, and the Constitution will bear us out in it. Among other things, that instrument says that Congress shall make no law impairing the validity of contracts. You have contracted to be united with your wives in time and in eternity, and it would not do for us to break a constitutional law, would it?

Now, what will we do in our relations with the United States? We will observe the law as we have done, and be as faithful as we have been. We will maintain our principles and live our religion and keep the commandments of God, and obey every constitutional law, pursuing that course that shall direct us in all things.

( Source: Journal of Discourses 23:68 )