Dr. Joan Boney, Jesus Ministries ...
This means: When we belong to God, HE will put HIS desires into our hearts. We will find we want to do something and we pray about it and we have no idea that God has planted HIS own desire for us into our heart!
Psalm 37:4 Delight thyself also in the Lord: and HE shall give thee the desires of thine heart.
(Delight in "the Lord", in "The Word" given us by God by HIS Spirit.)
Example in this Podcast.