Humanity seeks unity which can be found through the Holy Spirit, Pope Benedict XVI said in his second address to the young World Youth Day people today.

Speaking in front of the tens of thousands of young people gathered for this evening's prayer vigil in Randwick Racecourse, Pope Benedict said that the human soul cried out for unity a fragmented and divided world.

"You are already well aware that our Christian witness is offered to a world which in many ways is fragile. The unity of God's creation is weakened by wounds which run particularly deep when social relations break apart, or when the human spirit is all but crushed through the exploitation and abuse of persons."

Society, he said in his 25 minute-long address, is being fragmented by short-sighted attitudes which ignore the full horizon of truth: "the truth about God and the truth about us". By definition, relativism is incapable of showing the whole picture because it ignores the principles that "enable us to live and flourish in unity order and harmony".

But unity and reconciliation he said could not be achieved through human's efforts alone, but only through God and the Church. Pope Benedict warned that the temptation to create artificial "perfect" communities in the "face of imperfections and disappointments-both individual and institutional".

The Holy Father said: "That temptation is not new. The history of the Church includes many examples of attempts to bypass or override human weaknesses or failures in order to create a perfect unity, a spiritual utopia."