Pope Francis, who was reunited on Friday with one of the Syrian refugees he brought home with him from Lesbos, Greece, has said migrants do not pose a danger to Europe's culture but rather a challenge for societies to grow.

Francis made the comments during a visit to the Roma Tre university, one of the main public universities in the Italian capital. There, he met with Nour Essa, who along with her husband and child flew back to Rome with the Pope after his trip to Lesbos last April.

Since then, Essa has won a government scholarship to finish her biology studies at Roma Tre and has become an activist for refugee rights in her new country.