When one door closes another door opens; but we so often look so long and so regretfully upon the closed door, that we do not see the ones which open for us.  

-Alexander Graham Bell

"It would seem that our Lord finds our desires not too strong, but too weak. We are half-hearted creatures, fooling about with drink and sex and ambition when infinite joy is offered us, like an ignorant child who wants to go on making mud pies in a slum because he cannot imagine what is meant by the offer of a holiday at the sea. We are far too easily pleased."

-C.S. Lewis

"The Lord is intent on your personal growth and development. Your progress is accelerated when you willingly allow Him to lead you through every growth experience you encounter, whether you welcome the experience or not. Trust in the Lord. Ask to be led by the Spirit to know His will. Be willing to accept it. You will then qualify for the greatest happiness and the heights of attainment from this mortal experience."

-Elder Richard G. Scott

(The rest of the talk is here. I highly recommend it!)