Balconies and sidewalks were packed as the papal mobile slowly rolled toward Notre Dame. People rushed to kiss Leo's hand before he continued into the cathedral during the first papal visit to France in 18 years.
The Vatican estimates that 300,000 people followed the procession.
Earlier in the day, the Pope spoke at the Élysée Palace with President Emmanuel Macron at his side.
If we are to avoid losing our humanity in the midst of a paradise of machines, which invade and influence our daily lives, there is an urgent need for education in ethical discernment, Leo said.
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