Certainly this is true regarding love. I'm not very old (ignoring how I feel sometimes), but I've had a few experiences with love in my life. I first fell in love in junior high. I felt things for an attractive young woman that I had never before experienced. I would have done anything to win her approval. But I was painfully shy. Long story short, I loved her from a distance until finally tracking her down in the later years of high school after I had gained some confidence and feelings of self-worth. We went on one date, and I just wasn't really interested in her much after that. I suppose I had built her up in my mind to be the perfect woman based on what I had seen and known of her. Although I sat next to her every single day in junior high, that date was the first time I had actually had a conversation with her. With just a little investigation, I quickly learned that she was not all I had made her up to be.
The thing is, I know I was in love with her before. I knew it at the time with so much conviction that I can't possibly deny it now either. I loved her. That was completely true all through junior high, and a good chunk of high school. But it was no longer true after that first date.
What is it that a feeling tells us? Did loving that girl tell me that we were meant to be together? Of course not. I sure wished it did at the time, but it didn't realistically tell me anything beyond that I loved her. That feeling of love did not mean she was the perfect young woman, that she would be a wonderful mother, that she would listen to me and respect me, that she cared more for others than herself, that she shared my same values and interests, and so on. All that feeling told me was that I felt very strongly for her.
Using this example in regards to the topic of this blog, what is it that an emotional conviction tells us about the truth of the Church? When feeling an answer to prayer, does this really tell us that the Church is true, or does it tell us that what we know so far sounds attractive? Does it really tell us that Joseph Smith saw God and Jesus Christ and dozens of other heavenly beings, or does it tell us that such a message gives us hope?
In other words, the feeling of love for that girl did not mean much on a realistic level. That wasn't enough to make us truly compatible. A feeling that Joseph Smith was a prophet does not mean that he literally held golden plates and translated them. Learning more about the girl caused me to feel something different about her. Maybe understanding more about Joseph Smith and the kind of man he was can cause someone to feel different about him and his claims.
Here's the real issue, though, I think; it was not fun to fall out of love with this young woman. It was an amazing feeling, and it motivated me very much. It was a wonderful feeling to have pumping through me. But it would not have been useful or healthy to still feel that even though we were truly incompatible and a marriage would not have worked. Similarly, why would one want to lose that spiritual high that comes with the belief of being among the elite chosen of God, who hold the power to act in His name, who have communication directly from Him? But that feeling of comfort and bliss does not confirm that, in reality, paying your tithing month after month is going to keep you from getting burned (D&C 64:23). It may be that Joseph Smith's doctrine and actions are heading in a different direction than you want or thought you were.
In brief, love alone does not mean two people are meant to be together. Feelings of peace about the First Vision alone do not mean that marrying other men's wives is okay.