Pope Francis

In his new exhortation, "The Joy of Love," Francis addresses marriage, sex and love. For a 79-year-old man who has taken a lifelong vow of celibacy, the pontiff has some pretty solid tips.

On Friday, Pope Francis announced that the Catholic Church should work with couples to determine the best choices for them. He spoke of prioritizing individual conscience on contraception, too.

The visit by the leaders of the Eastern and Western churches — announced by Greek church and government officials, but not confirmed by the Vatican — would signal support for migrants and refugees.

The pontiff is marking Good Friday with a traditional services, but on Holy Thursday, he broke with tradition by washing the feet of migrants of many faiths.

The pontiff has signed up for the photo-based social media site under the username "Franciscus."

In addition to Mother Teresa, four other Catholic figures — who lived in Argentina, Mexico, Sweden and Poland — will become saints this year.

Canonization is pricey: One journalist estimates half a million dollars is spent per candidate. Until now, it was spent with little oversight or documentation. Pope Francis is pushing to change that.

"The commandment, 'Thou shalt not kill,' has absolute value, and concerns both the innocent and the guilty," Pope Francis says.

Pope Francis was criticizing Republican presidential candidate Donald Trump's plan to build a wall on the U.S.-Mexico border. Trump called the comment "disgraceful."

The pope firmly ruled out abortion for pregnant women who fear effects of the Zika virus — but said that "in certain cases," contraception might be a lesser evil, without directly approving its use.