Today's Supreme Court decision legalizing same-sex marriage in all 50 states completely undermines America's democratic process.

That's the bold statement Chief Justice John Roberts made in his principal dissent. In one day, Roberts said, the court has basically transformed the societal institution that has held together humanity for millennia.

"Who do we think we are?" he said.

Here's more  from Roberts's dissent -- something he read for the first time out loud from the bench to signal his strong disagreement with the court's 5-to-4 decision:

Emotional scenes from same-sex weddings around the U.S. on Friday

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Rodrigo Zamora (L) and Ashby Hardesty pose together for friends at the New York City clerks office after their wedding in Manhattan in New York June 26, 2015. The Supreme Court ruled on Friday that the U.S. Constitution provides same-sex couples the right to marry, handing a historic triumph to the American gay rights movement. Hardesty and Zamora waited until the Supreme Court decision before getting married to each other. They were engaged two years ago at the Stonewall Inn the last time the U.S. Supreme Court decided on same sex marriage. REUTERS/Brendan McDermid (Brendan Mcdermid/Reuters)

Roberts's unequivocal disagreement is somewhat startling, especially as the conservative-leaning justice seemed to be searching for a middle ground just a few months ago during oral arguments on the case, reported The Washington Post's Robert Barnes.

The chief justice has a particular obligation "to try to achieve consensus," Roberts has said.

But Roberts didn't agree with the Supreme Court's 2013 decision to expand federal rights to legally married gay couples. And he made clear Friday that no consensus is worth a decision he feels oversteps the court's constitutional bounds.

Near the end of his 29-page dissent, Roberts registered this strongly worded reprimand:

"If you are among the many Americans -- of whatever sexual orientation -- who favor expanding same-sex marriage, by all means celebrate today's decision. Celebrate the achievement of a desired goal. Celebrate the opportunity for a new expression of commitment to a partner. Celebrate the availability of new benefits. But do not celebrate the Constitution. It had nothing to do with it."
The Supreme Court's gay marriage decision explained in 60 seconds. (Gillian Brockell/The Washington Post)