In the world of music, there is a device called a Tuning Fork. This device is a two-pronged fork that is used in music as a "standard of pitch" so that you may tune other musical insturments. After striking the Tuning Fork against a hard surface of some sort, the forks start to vibrate giving you your pitch.
Your probably asking yourself right now, what does this have to do with anything? Well let me tell you. In our lives we go through a lot. We go through disappointment, disouragement, heart ache, etc. When we have our lives in "tune" with what we know is right it allows us to be more happy than we were before. When we know God is pleased with us it relieves some stress whether we realize it or not.