VATICAN CITY — Whether the new year will be good or not depends on us choosing to do good each day, Pope Francis said.

"That is how one builds peace, saying 'no' to hatred and violence — with action — and 'yes' to fraternity and reconciliation," he said Jan. 1, which the Church marks as the feast of Mary, Mother of God and as World Peace Day.

Speaking to the some 50,000 pilgrims gathered in St. Peter's Square for the first noon Angelus of 2017, the pope referred to his peace day message in which he asked people to adopt the "style" of nonviolence for building a politics for peace.

Lamenting the brutal act of terrorism that struck during a night of "well-wishes and hope" in Istanbul, the pope offered his prayers for the entire nation of Turkey as well as those hurt and killed. A gunman opened fire during a New Year's Eve celebration at a popular nightclub early Jan. 1, killing at least 39 people and wounding at least 70 more.

"I ask the Lord to support all people of good will who courageously roll up their sleeves in order to confront the scourge of terrorism and this bloodstain that is enveloping the world with the shadow of fear and confusion," he said.

Earlier in the day, the pope spoke of how maternal tenderness, hope and self-sacrifice were the "strongest antidote" to the selfishness, indifference and "lack of openness" in the world today.

Celebrating Mass in St. Peter's Basilica, which was decorated with bright red anthuriums, evergreen boughs, white flowers and pinecones brushed with gold paint, the pope said that a community without mothers would be cold and heartless with "room only for calculation and speculation."

The pope said he learned so much about unconditional love, hope and belonging from seeing mothers who never stop embracing, supporting and fighting for what is best for their children incarcerated in prisons, ill in hospitals, enslaved by drugs or suffering from war.

"Where there is a mother, there is unity, there is belonging, belonging as children," he said.

Just like all mothers of the world, Mary, Mother of God, "protects us from the corrosive disease of being 'spiritual orphans,'" that is when the soul feels "motherless and lacking the tenderness of God, when the sense of belonging to a family, a people, a land, to our God, grows dim."

"This attitude of spiritual orphanhood is a cancer that silently eats away at and debases the soul," which soon "forgets that life is a gift we have received — and owe to others — a gift we are called to share in this common home," he said.

A "fragmented and divided culture" makes things worse, he said, leading to feelings of emptiness and loneliness.

"The lack of physical and not virtual contact is cauterizing our hearts and making us lose the capacity for tenderness and wonder, for pity and compassion," he said, as well as making us "forget the importance of playing, of singing, of a smile, of rest, of gratitude."