Catholic priests and nuns must renounce their personal interests and create a church that "goes into the world" with "living writers of the Gospel," Pope Francis said.

"In our lives as priests and consecrated persons, we can often be tempted to remain enclosed, out of fear or convenience, within ourselves and in our surroundings," the pontiff said on Saturday during a Mass with Polish religious, priests, seminarians and bishops.

"Jesus directs us to a one-way street: that of going forth from ourselves," he said. "It is a one-way trip, with no return ticket. It involves making an exodus from ourselves, losing our lives for his sake."