Our Scripture reading today is Psalm 119:28, "My soul melteth for heaviness: strengthen thou me according unto thy word."
If you take the time to read several of the previous verses of this chapter, you will get a little more incite into why the psalmist was experiencing this heaviness of soul.  His physical and mental strength were weakening due to the stress of life.  The heaviness of life has done its work when it brings us to the throne of God.  
The psalmist prayed for strength from and according to the Word of God.  “The singer is bowed down, overwhelmed. He sorely needs succour and strength. How does he seek it? Not by asking for pity, but by a determined application to the law of his God.” (Morgan).  Praise and thank God for His Word!  It will strengthen us time and time again.