«URBI ET ORBI» RADIOMESSAGE
OF HIS HOLINESS JOHN PAUL I
Sunday, 27 August 1978
"Although the ship is tossed about, it is still a ship. It carries the disciples and it receives Christ. Yes, it is tossed on the sea but without it, one would immediately perish" (Sermon 75,3; PL 38, 475). Only in the Church is salvation: without it one perishes!
http://www.vatican.va/holy_father/john_paul_i/messages/documents/hf_jp-i_mes_urbi-et-orbi_27081978_en.html