Elder Boyd K. Packer said:

"Shortly after I was called as a General Authority, I went to Elder Harold B. Lee for counsel.  He listened very carefully to my problem and suggested that I see President David O. McKay.  President McKay counseled me as to the direction I should go.  I was very willing to be obedient but saw no way possible for me to do as he counseled me to do.

"I returned to Elder Lee and told him that I saw no way to move in the direction I was counseled to go.  He said, 'The trouble with you is you want to see the end from the beginning.'  I replied that I would like to see at least a step or two ahead.  Then came the lesson of a lifetime:

'You must learn to walk to the edge of the light, and then a few steps into the darkness; then the light will appear and show the way before you'"