I don't know who gave those talks that you refer to, but it wasn't the Prophet Joseph Smith:
Elder Rudger Clawson explained the sacred obligation of keeping accurate temple records:
"In the early days of the Church, some baptisms for the dead that were not properly witnessed and recorded, were rejected of the Lord, and the work had to be done over again. We know that great care and attention is given to this matter today in our Temples, and that efficient help must be secured to do this. ... Truly it is a great and marvelous work, and not the least important thing about it is that these ordinances are all carefully recorded in the books and are filed away in the archives of the Temple, to be brought forth in due time. From these records the people who have gone to that house will be judged. Nothing that is done in that Temple will be accepted of the Lord, except it is properly witnessed and recorded."
(In Conference Report, Apr. 1900, pp. 43-44.)