Father Bernabé Dalmau, monk of Montserrat, gave the meditative conference The rhythm of the seasons in Christian spirituality. The presentation remarked how the agricultural natural cycle influenced the Jewish holidays and how Christianity, in a certain continuity of Judaism, composed its calendar according to the Jewish tradition and transforming, giving them a new meaning, ancient traditional festivals of Roman paganism. The connection of the solar cycle and the elements of nature with the main facts of Christianity makes us discover the ecological dimension that Pope Francis emphasized in the encyclical Laudato Si.