Pierre Teilhard de Chardin Quotes about Past

"The Making of a Mind: Letters From a Soldier-Priest 1914-1919 (Letter dated September 5, 1919)". Book by Pierre Teilhard de Chardin, 1965.
The Age of Nations is past. The task before us now, if we would not perish, is to build the Earth.
Pierre Teilhard de Chardin (1969). “Building the Earth: And The Psychological Conditions of Human Unification”
Pierre Teilhard de Chardin (2015). “The Divine Milieu”, p.73, Lulu Press, Inc