Pope Benedict today said he hoped Christmas would bring consolation to those living in poverty, injustice and war and appealed for just solutions to conflicts in Iraq, the Holy Land, Afghanistan and Africa.
In his Urbi et Orbi(to the city and the world) Christmas Day message, the Pope also urged people in modern societies to accept the light of Christ and warned that many human tragedies were caused by environmental upheavals.
"May this Christmas truly be for all people a day of joy, hope and peace," he said in his address from the central balcony of St Peter's Basilica to tens of thousands of people below.
The address was broadcast live to some 57 countries.
"May the light of Christ, which comes to enlighten every human being, shine forth and bring consolation to those who live in the darkness of poverty, injustice and war," he said.
Christmas should bring hope to those "still denied their legitimate aspirations for a more secure existence, for health, education, stable employment, for fuller participation in civil and political responsibilities, free from oppression and protected from conditions that offend against human dignity".
The Pope, marking the third Christmas season of his reign, said he was close to society's most vulnerable members, who were often the main victims of conflict and terrorism - women, children, the elderly, migrants, refugees and evacuees.
He warned that "ethnic, religious and political tensions, instability, rivalry, disagreements, and all forms of injustice and discrimination are destroying the internal fabric of many countries and embittering international relations".
"Do we have time and space for God? Can he enter into our lives? Does he find room in us, or have we occupied all the available space in our thoughts, our actions, our lives for ourselves?" he said.
In the run-up to Christmas, the Pope several times urged Catholics to rediscover its religious significance, lamenting that the holiday had been dominated by materialism.
Yesterday the Pope lit a peace candle and placed it at the window of his apartment overlooking St. Peter's Square as the Vatican's life-size nativity scene was unveiled to the public below.
Later today, the Pope will deliver his traditional Christmas " Urbi et Orbi" ("to the city and the world") blessing from the basilica's central balcony. He was also due to deliver Christmas greetings in more than 60 languages.