Adon Olam
The Kotzker Rabbi was asked: "Why do we begin Services with 'Adon Olam' and finish with?'Adon Olam'??"
He answered: "We do so in order to demonstrate that the conclusion of the Services does not imply we have praised the Lord sufficiently. No, it is fitting that we should repeat the Services again and again. There is no limit to the praise we ought render the Creator."
Source: Siach Sarfei Kodesh
