Do you want to be more fruitful?  Short answer, take a rest.  

Psalm 69:1-3, 11-12, 20-21, 13-14, 18 MSG
Psalm 73:11-12, 25-28 MSG
Psalm 61:2 KJV
Philippians 4:6-8 KJV
John 6:16-33 KJV
Matthew 11:28-30 KJV
2 Corinthians 4:16-18 KJV