Here is God's loving challenge to you and to me today. He wants us to think of the deepest, highest, worthiest desire and longing of our hearts, something which perhaps was our desire for ourselves or for someone dear to us, yet which has been so long unfulfilled that we have looked upon it as only a lost desire, that which might have been but now cannot be, and so have given up hope of seeing it fulfilled in this life.
That thing, if it is in line with what we know to be His expressed will (as a son to Abraham and Sarah was), God intends to do for us, even if we know that it is of such utter impossibility that we only laugh at the absurdity of anyone's supposing it could ever now come to pass. That thing God intends to do for us, if we will let Him.
"Is anything too hard for the Lord?" Not when we believe in Him enough to go forward and do His will, and let Him do the impossible for us. Even Abraham and Sarah could have blocked God's plan if they had continued to disbelieve.
The only thing too hard for Jehovah is deliberate, continued disbelief in His love and power, and our final rejection of His plans for us. Nothing is too hard for Jehovah to do for them that trust Him
--Messages for the Morning Watch