Rather, the message of Christian faith comes from heaven and "is revealed by God and goes beyond this world," the Pope continued.
"To believe in the resurrection is essential, so that each of our actions of Christian love is not ephemeral and doesn't end in itself, but becomes a seed destined to bloom in the garden of God and produce fruit for eternal life."
After leading pilgrims in praying the traditional Marian prayer, Pope Francis noted how just two days ago the Paris Climate Agreement, a fruit of the COP21 Summit in Paris last year, went into effect.
Calling the accord an "important step forward," he said it demonstrates that "humanity has the ability to collaborate for the safeguarding of creation, to put the economy at the service of the people and to build peace and justice."
Francis pointed to a new climate summit set to open tomorrow, in Marrakech, Morocco, which is aimed, among other things, at the implementation of the Paris agreement. He voiced his hope that the process would be "guided by the awareness of our responsibility for the care of the common home."
Before concluding, he also noted how 38 martyrs were proclaimed Blessed in Albania Saturday, consisting of two bishops, several priests, a seminarian and some lay persons, all of whom were victims "of the strong persecution of the atheistic regime that long dominated that country in the previous century."
"These ones preferred to undergo imprisonment, torture and in the end death, in order to remain faithful to Christ and to the Church," he said, adding that their example "helps us to find in the Lord the strength that sustains us in difficult moments and which inspires attitudes of goodness, forgiveness and peace."