Desire, the feeling of unsatisfaction is a good thing if I am desiring the things that pertain to righteousness. If however, through unthankfulness for what God has already done for me, I begin to focus on my needs instead of what I can do for the kingdom, then my faith is erroded. If I focus on what I don't have long enough, my life is corrupted, my thinking becomes futile and my heart darkened. I become a complainer, a negative influence instead of a positive one. God's promises are true and they are more precious than the temporary comforts of this life. They are the great treasure of this life. I think corruption all begins with unthankfulness.