My friend Andrea shared this with me years ago. It has been on my mind recently so I wanted to share it with you:
"I hope that some day you will have a longing, a longing that seems to wring your soul (in expressing that hope I have your interest at heart) that you will meet a wall that seems insurmountable, impregnable; but if duty lies beyond that wall, do not stand back and say, 'I cannot do it.' You may aspire to do it, but that is not sufficient. Do what James . . . says: Ask God for power, but add to that faith, an acknowledgment of your own ability to do what you are able to do.
You can walk from where you stand, up to the wall. When you get there, and you have gone as far as you can, you will find in answer to your prayer that there is a hidden ladder by which you can scale it, or there is a door which you could not see from where you were first standing. God's hand is shown. In that hour you become responsive to the Infinite, and you realize what it means to be entitled to the guidance of the Holy Ghost; and he will guide you in these things."
David O. McKay