“And the LORD will guide you continually, and satisfy your soul in parched places, and they will strengthen your bones; and you'll be like a watered garden, like a spring of water, whose waters never fail.” (Isaiah 58:11 ISV)
When we are hungry, anything on the menu looks good. When our soul is dissatisfied, sin begins to look tempting. That is why it is important to notice the level of soul satisfaction in our life.
On the dashboard of any car are certain lights that tell us how hot the engine is running or when we are about to run out of oil. They are commonly called “idiot lights” -- I suppose because only an idiot would ignore them. Likewise, the main light on the dashboard of our heart is our “soul satisfaction” light. This is why in the Bible there are so many commandments that call us to joy: “The joy of the Lord is your strength” and “Rejoice in the Lord always; again I will say rejoice!”
-- John Ortberg in The Me I Want to Be