In his first encyclical, Deus caritas est, he said that a human being, created in the image of God who is love, can practice love: to give himself to God and others (agape) by receiving and experiencing God's love in contemplation. This life of love, according to him, is the life of the saints such as Teresa of Calcutta and the Blessed Virgin Mary, and is the direction Christians take when they believe that God loves them in Jesus Christ. The encyclical contains almost 16,000 words in 42 paragraphs. The first half is said to have been written by Benedict in German, his first language, in the summer of 2005; the second half is derived from uncompleted writings left by his predecessor, Pope John Paul II. The document was signed by Benedict on Christmas Day, 25 December 2005. The encyclical was promulgated a month later in Latin and was translated into English, French, German, Italian, Polish, Portuguese, and Spanish. It is the first encyclical to be published since the Vatican decided to assert copyright in the official writings of the pope. Benedict's second encyclical titled Spe Salvi ("Saved by Hope"), about the virtue of hope, was released on 30 November 2007. His third encyclical titled Caritas in veritate ("Love in Truth" or "Charity in Truth"), was signed on 29 June 2009 (the Feast of Sts. Peter and Paul) and released on 7 July 2009. In it, the Pope continued the Church's teachings on social justice. He condemned the prevalent economic system "where the pernicious effects of sin are evident," and called on people to rediscover ethics in business and economic relations. At the time of his resignation, Benedict had completed a draft of a fourth encyclical entitled Lumen fidei ("The Light of Faith"), intended to accompany his first two encyclicals to complete a trilogy on the three theological virtues of faith, hope, and love. Benedict's successor, Francis, completed and published Lumen Fidei in June 2013, four months after Benedict's retirement and Francis's succession. Although the encyclical is officially the work of Francis, paragraph 7 of the encyclical explicitly expresses Francis's debt to Benedict: "These considerations on faith — in continuity with all that the Church's magisterium has pronounced on this theological virtue – are meant to supplement what Benedict XVI had written in his encyclical letters on charity and hope. He himself had almost completed a first draft of an