I wanted to address this separate.
I think that we can build our faith to the point where God will give us what we ask, reveal to us when we seek, and open to us when we knock.
There have been men and probably women too who have been given the sealing power. Anything that they ask, God will do, because God knows that they will not ask amiss. This is still possible today. If it isn't happening, it isn't God's fault, its because of a lack of faith and anybody has access to this gift.
Nephi received this gift after exercising faith. So, I'm not talking about not exercising faith. I'm talking about what is available to us as a result of great faith.
-Finrock