May 1888
New Mormon History Database; “At the dedication of the Manti temple, Wilford Woodruff says, “We are not going to stop the practice of plural marriage until the Coming of the Son of Man.” … While in the temple, Woodruff “Consecrated upon the Altar the [brown] seers Stone that Joseph Smith found by Revelation some 30 feet under the Earth.”” – May 1888, D. Michael Quinn
Six Months Later, December 1888…
New Mormon History Database; “Senior apostle Wilford Woodruff tells meeting of Twelve, “The Lord never will give a revelation to abandon plural marriage.”” – December 1888, D. Michael Quinn
period is provided by a letter from Wilford Woodruff to George A. Smith in April 1857: We 
have had a great reformation this winter; some of the fruits are: all have confessed their sins either great or small, restored their stolen property; all have been baptized from the presidency down; all are trying to pay their tithing and nearly all are trying to get wives, until there is hardly a girl 14 years old in Utah, but what is married, or just going to be. President Young has hardly time to eat, drink or sleep, in consequence of marrying the people and attending the endowments.” – Eugene E. Campbell and Bruce L. Campbell
