POW!!!
~ Wilford Woodruff, 4th LDS President
I don't want to pick at nits, but didn't he entered into another polygamous marriage after that statement when he married Ms. Mountford in 1897?
As a lawyer with some experience at dancing in the head of a pin, there's a difference between 'present intention' and an agreement. Grammatically, that's also the difference between 'will' and 'shall' in the first person (particularly for legal documents). Shall means you are going to do it. Will means you have a present intention, but that may change. In the second- and third-person, it's just the opposite (man, we attorneys make things confusing. Will, with respect to a second or third party, is a commitment. Shall is present intention. Although that distinction has been watered down greatly in recent years just as grammar has been watered down.
So he used weasel words. He didn't said he would submit. He said he intended to submit.
That's my Johnny Cochran $29.95 apologetic argument for why it was okay to double-cross the U.S. government. He changed his mind. Yeah. That's the ticket.
Just disregard the fact that the Utah Constitution not only forbids polygamy, but has a singularly unique provision that the people of Utah can't bring back polygamy without the consent of the federal government.