Mr Turnbull offered a swingeing demolition of the case against gay marriage - and also pointedly said that previously Liberals had been given a conscience vote on marriage issues.
''I am utterly unpersuaded by the proposition that my marriage to Lucy, or indeed any marriage, is undermined by two gay men or two lesbians setting up house down the road - whether it is called a marriage or not,'' he said.
''Do the bishops seriously imagine that legalising gay marriage will result in thousands of parties to heterosexual marriages suddenly deciding to get divorced so they can marry a person of the same sex?'' he said.
大主教真的相信,让同性恋婚姻合法化,会导致很多异性恋家庭的破裂,异性恋纷纷离婚去找同性恋么?
''Are not the gays who seek the right to marry, to formalise their commitment to each other, holding up a mirror to heterosexuals who are marrying less frequently and divorcing more often?''