I'm looking for the story about a shepherd who prayed to G-d using only his own prayers. When a rabbi heard him praying one day he decided to teach him to pray using only traditional Jewish prayers. After the rabbi taught the shepherd the traditional prayers and moved on, the shepherd forgot the traditional prayers. The shepherd was embarrassed by this so he stopped praying all together. G-d noticed the shepherd had stopped praying and was disappointed because G-d liked the shepherd's singing. Does anyone know this story or have a link to it.