"The trouble with excuses, however, is that they become inevitably difficult to believe after they’ve been used a couple of times."

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I'm not sure that it's right to view this as excluding a particular group. When the institution of marriage developed historically, people didn't get around and say, 'Let's have this institution, but let's keep out homosexuals.' The institution developed to serve purposes that, by their nature, didn't include homosexual couples.

— John Roberts