Many, if not all of the LDS prophets who have passed have stated something that is now considered as "He was speaking as a man".. but those who followed them back in there day didn't hold to the same beliefs.
When President Gordon Hinckley answered Larry King on his show about caffeine.
Larry King: No to caffeine?
Gordon B. Hinckley: No to caffeine, coffee and tea.
And when Hinckley was interviewed on 60 min by Mike Wallace:
My husband drank Mountain Dew but only on long drives out of state to and from work. He drank it to keep himself awake to make it home in one piece. But the thought of him drinking something that the Prophet said Mormons didn't do, troubled him deeply! Deeply enough that stopped drinking it totally and put his life in jeopardy getting behind the wheel of the car, making the drive home, a lot of the time alone or with other tired, sleeping passengers in his care, without the aid of any caffeinated beverages to help him stay awake and alert.
On the BYU Campus some students were complaining about not being able to purchase caffeinated soda on campus.
Not long after this the LDS church came forward with an official "Revelation" on caffeinated soda. I thought they already had a stance on caffeine.. It wasn't suppose to be consumed if you were a member of the LDS church.. Why the change? A day later the "Revelations" wording changed.
This may seem trivial.. and it is, because people are going to do whatever it is they want in the safely and comfort of their own homes. No one can tell you what you can and can't eat or drink. What clothing you have to wear and what media and literature you choose to view. It's between you and God. Not you and another Man.
I'm bringing this up because of all the changes in the LDS church. One living prophet can contradict a passed prophet and never be questioned. Back in Brigham Young's day, he stated that Adam was God. His followers followed him with all their heart and soul and knew that God was speaking through him revealing hidden or new found truths. That doctrine is found to no longer be true in today's LDS Doctrines. Why? Why should the followers of the passed believe a doctrine to be true but in our day it's believed to be false? How can someone choose to believe that they were speaking as a Man when clearly, he was your prophet of your church?
What about Polygamy?
He (Brigham Young)stated that if the Church ever turned away from living polygamy, the Devil would rejoice.
"We are told that if we would give up polygamy - which we know to be a doctrine revealed from heaven, and it is God and the world for it - but suppose this Church should give up this holy order of marriage, then would the devil, and all who are in league with him against the cause of God, rejoice that they had prevailed upon the Saints to refuse to obey one of the revelations and commandments of God to them." JoD 11:239 (June 3, 1866)
He also stated it's polygamy was ever given up you will be damned.
"Now if any of you will deny the plurality of wives, and continue to do so, I promise that you will be damned; and I will go still further and say, take this revelation, or any other revelation that the Lord has given, and deny it in your feelings, and I promise that you will be damned." JoD 3:266 (July 14, 1855)
Polygamy is no longer lived in the LDS church, unless you are male and have divorced your wife or your wife passed away then married again having another woman sealed to you. Women are not allowed to be sealed to more then one man. It's been changed and removed from the official doctrine.
Along with all these are also:
-As Man Is, God Once Was
-Blacks and the Priesthood
-Law of adoption
-Speaking in tongues
-Word of Wisdom
-Removed the Lectures on Faith from the Doctrine and Covenants
....and many more...
How do you truly know when an LDS prophet is speaking as a man or a prophet? You can start with God's word.
"But the prophet, which shall presume to speak a word in my name, which I have not commanded him to speak, or that shall speak in the name of other gods, even that prophet shall die.
And if thou say in thine heart, How shall we know the word which the Lord hath not spoken?
When a prophet speaketh in the name of the Lord, if the thing follow not, nor come to pass, that is the thing which the Lord hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him." Deuteronomy 18:20-22
Go down the list of your prophets. Has every word, that they spoke in the name of the Lord, come to pass? If not, what excuses will you come up with to justify why? Are you going to fully believe the word of God or put your trust in Men? Men, who supposedly were speaking for God in their time, having the words they uttered be nothing more then mere words from a man in our time. Words that hold no power or authority now, because yet another Man said they were speaking "As a Man".
What a confusing existence to live trusting in the arm of flesh and not an all mighty, all powerful, omnipotent, perfect God.