Desires...

“Delight yourself in the Lord and He will give you the desires of your heart.”
- Psalms 37: 4
“Above ALL else, guard your heart for it is the source of life. “- Proverbs 4:23

Both these verses deal with the heart. The heart is the center of our well-being. Without it fulfilling its function, the body perishes. Just as the body perishes, so does our soul if it is not protected.
I think a lot of Christians struggle with obeying or even fully comprehending Psalms 37:4. Many of times, we think that if God grants the desires of our heart then it will be easier to follow him. But this isn’t what the verse is saying. It is a cause/effect relationship. IF you delight in the Lord, THEN he will give you the desires of your heart. However, God will not be used as a means to an end. He will not show himself to you if you are searching for him to find answers to your future, success, a relationship, etc. I found a quote, by A.W. Tozer, that I love: “The mighty God, the maker of heaven and earth, will not be one of many treasures, not even the chief of all treasures. He will be all in all or He will be nothing. God will not be used."
Sometimes, though, when you venture on the journey of delighting yourself in the Lord, you find that as you fall more in love with Christ, your desires may change. Our desires will line up with God's when our heart is in the right place. There have been numerous examples in my life that I have found out that when I am seeking God and asking His will to be manifested in my life, my desires change. It is often a painful process but is always worth it.