Pope Francis told the mayors that they were important because they were at the "grass roots" and could make concrete changes and put pressure on leaders above them.
Families are weakened and destroyed by war, "the mother of all forms of poverty," as well as by economies and policies that worship money and power, Pope Francis said.
Abortion, abandoning migrants at sea, unsafe working conditions, malnutrition, terrorism and euthanasia are all "attacks on life," said Pope Francis.
"Our communion with God always brings forth fruit, always gives life," Pope Francis said in his homily.
Pope Francis returned to his roots July 12 when he visited Banado Norte, a poor neighborhood near the Paraguay River where residents battle seasonal flooding and face possible eviction.
Vatican magistrates have decided to postpone the proceedings of a criminal trial against a former Vatican nuncio due to the defendant's ill health.
The archbishop called Pope Francis' visit "a true gift for all regardless of faith tradition."
"For the fervor that he's showed, for the humility he showed us — he shared as if he were one of us — it's something so inexplicable that today we have him as pope."
"From the peak of Chimborazo to the Pacific coast, from the Amazon rainforest to the Galapagos Islands, may you never lose the ability to thank God for what he has done and is doing for…
Louis Martin (1823-1894) and Marie Zelie Guerin Martin (1831-1877) will be the first married couple with children to be canonized in the same ceremony. Other married couples are among the blesseds of the church.