The last sunday blessing of Pope Benedict.

"The Lord is calling me to climb the mountain - prayer is not an isolation from the world," he said. 

"I am not abandoning the Church and shall continue to serve it in a manner more adapted to my age and strength," through prayer and meditation, he added. 

Pope Benedict will hold his last public appearance as pope in the square on Wednesday before he retires to a life of seclusion and prayer. 

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