Until Wednesday, the thousands of same-sex couples who have married did so because a state judge or Legislature allowed them to. The nation’s most fundamental guarantees of freedom, set out in the Constitution, were not part of the equation. That has changed with the historic decision by a federal judge in California, Vaughn Walker, that said his state’s ban on same-sex marriage violated the 14th Amendment’s rights to equal protection and due process of law.

The decision, though an instant landmark in American legal history, is more than that. It also is a stirring and eloquently reasoned denunciation of all forms of irrational discrimination, the latest link in a chain of pathbreaking decisions that permitted interracial marriages and decriminalized gay sex between consenting adults.

As the case heads toward appeals at the circuit level and probably the Supreme Court, Judge Walker’s opinion will provide a firm legal foundation that will be difficult for appellate judges to assail.

The case was brought by two gay couples who said California’s Proposition 8, which passed in 2008 with 52 percent of the vote, discriminated against them by prohibiting same-sex marriage and relegating them to domestic partnerships. The judge easily dismissed the idea that discrimination is permissible if a majority of voters approve it; the referendum’s outcome was “irrelevant,” he said, quoting a 1943 case, because “fundamental rights may not be submitted to a vote.”

He then dismantled, brick by crumbling brick, the weak case made by supporters of Proposition 8 and laid out the facts presented in testimony. The two witnesses called by the supporters (the state having bowed out of the case) had no credibility, he said, and presented no evidence that same-sex marriage harmed society or the institution of marriage.

Same-sex couples are identical to opposite-sex couples in their ability to form successful marital unions and raise children, he said. Though procreation is not a necessary goal of marriage, children of same-sex couples will benefit from the stability provided by marriage, as will the state and society. Domestic partnerships confer a second-class status. The discrimination inherent in that second-class status is harmful to gay men and lesbians. These findings of fact will be highly significant as the case winds its way through years of appeals.

One of Judge Walker’s strongest points was that traditional notions of marriage can no longer be used to justify discrimination, just as gender roles in opposite-sex marriage have changed dramatically over the decades. All marriages are now unions of equals, he wrote, and there is no reason to restrict that equality to straight couples. The exclusion of same-sex couples from marriage “exists as an artifact of a time when the genders were seen as having distinct roles in society and in marriage,” he wrote. “That time has passed.”

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