Pope Francis on Sunday wrapped up a weekend trip to Belgium, where he faced some of the strongest criticism yet levied during one of his foreign trips.

Belgium’s prime minister blasted Pope Francis for the Catholic Church’s horrific legacy of clerical sex abuse and cover-ups, demanding “concrete steps” to come clean with the past and put victims’ interests ahead those of the institution in a blistering welcome at the start of Francis’ visit on Friday.

In his first general audience since returning from the longest international trip of his pontificate, the pope expressed gratitude to God for his experiences.