C
If the desires of your heart agree with the desires of His heart they will be given to you. Sometimes what we desire, although appear to us as things we need, is not necessarily in His plan for us. So if you desire a child, but never have one, than the Lord has a ministry for you that could never be accomplished if you were "burden-down" with children. (Not that children are a burden!) That is why one says, the Lord's will be done, don't fulfill my desires Lord unless they are good for you.......and me.