Excerpts from the dissenting opinion written by U.S. Supreme Court Chief Justice John Roberts:

Petitioners make strong arguments rooted in social policy and considerations of fairness. They contend that same-sex couples should be allowed to affirm their love and commitment through marriage, just like opposite-sex couples. That position has undeniable appeal; over the past six years, voters and legislators in eleven states and the District of Columbia have revised their laws to allow marriage between two people of the same sex.

But this Court is not a legislature. Whether same-sex marriage is a good idea should be of no concern to us. Under the Constitution, judges have power to say what the law is, not what it should be. The people who ratified the Constitution authorized courts to exercise “neither force nor will but merely judgment.”

Although the policy arguments for extending marriage to same-sex couples may be compelling, the legal arguments for requiring such an extension are not. The fundamental right to marry does not include a right to make a state change its definition of marriage. And a state’s decision to maintain the meaning of marriage that has persisted in every culture throughout human history can hardly be called irrational. In short, our Constitution does not enact any one theory of marriage. The people of a state are free to expand marriage to include same-sex couples, or to retain the historic definition.

Today, however, the Court takes the extraordinary step of ordering every state to license and recognize same-sex marriage. Many people will rejoice at this decision, and I begrudge none their celebration. But for those who believe in a government of laws, not of men, the majority’s approach is deeply disheartening. Supporters of same-sex marriage have achieved considerable success persuading their fellow citizens — through the democratic process — to adopt their view. That ends today. Five lawyers have closed the debate and enacted their own vision of marriage as a matter of constitutional law. Stealing this issue from the people will for many cast a cloud over same-sex marriage, making a dramatic social change that much more difficult to accept.

The majority’s decision is an act of will, not legal judgment. The right it announces has no basis in the Constitution or this Court’s precedent. The majority expressly disclaims judicial “caution” and omits even a pretense of humility, openly relying on its desire to remake society according to its own “new insight” into the “nature of injustice.” As a result, the Court invalidates the marriage laws of more than half thesStates and orders the transformation of a social institution that has formed the basis of human society for millennia … . Just who do we think we are?