"Love and truth are inseparable," he said, explaining that "(f)aith transforms the whole person precisely to the extent that he or she becomes open to love."
In the contemporary world, love is seen as an emotion unrelated to truth, he observed. But in reality, "love is an experience of truth," which allows us "to see reality in a new way, in union with the beloved."
"Only to the extent that love is grounded in truth can it endure over time, can it transcend the passing moment and be sufficiently solid to sustain a shared journey. If love is not tied to truth, it falls prey to fickle emotions and cannot stand the test of time."
"The light of love proper to faith can illumine the questions of our own time about truth," Pope Francis said, noting that truth is viewed subjectively by the modern world, and objective truth is seen as a threat.
"But if truth is a truth of love, if it is a truth disclosed in personal encounter with the Other and with others, then it can be set free from its enclosure in individuals and become part of the common good," he said. "As a truth of love, it is not one that can be imposed by force; it is not a truth that stifles the individual."
Because it is grounded in truth, faith can also benefit science, the Pope said, because it "encourages the scientist to remain constantly open to reality in all its inexhaustible richness," recognizing that "nature is always greater."
The importance of the Church was also a focus of the document. While the Holy Father stated that any person "who sets off on the path of doing good to others is already drawing near to God," he also noted that it is "impossible to believe on our own."
"Faith is not simply an individual decision which takes place in the depths of the believer's heart, nor a completely private relationship," he said. Instead, faith by its very nature "is open to the 'We' of the Church; it always takes place within her communion."
"We can respond in the singular – 'I believe' – only because we are part of a greater fellowship, only because we also say 'We believe.'"
It is the gift of apostolic succession that protects and ensures the unity of the faith, transmitted from generation to generation, he continued, stressing the importance of prayer, the profession of faith, the Ten Commandments and especially the sacraments in the Church's transmission of the faith.
He also noted the key role of family as a critical setting for the growth of faith, specifically referencing "the stable union of man and woman in marriage," which creates the good of new life.
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Faith is also a common good for society, the Holy Father observed. "Its light does not simply brighten the interior of the Church, nor does it serve solely to build an eternal city in the hereafter; it helps us build our societies in such a way that they can journey towards a future of hope."
Because it is linked to trustworthy love, the light of faith can serve justice and peace, he explained. It unites men and women, allows them to respect nature, in which they see the hand of God, and gives light and hope to their suffering.
"To those who suffer, God does not provide arguments which explain everything," the Pontiff remarked, "rather, his response is that of an accompanying presence," seen in Christ who chose to walk the path of suffering with us and illuminate it with his light.
Pope Francis also emphasized that our faith must not remain interior, but should naturally and necessarily result in evangelization.
"Faith is not a private matter, a completely individualistic notion or a personal opinion: it comes from hearing, and it is meant to find expression in words and to be proclaimed," he stated.
If we truly allow faith to touch our lives, he explained, we will be continually renewed and transformed in a way that will reach out to those around us.