When the Supreme Court upheld West Virginia’s ban on transgender girls participating in girls’ school sports in West Virginia v. B.P.J., it said the ruling was about protecting the safety and fairness of women’s and girls’ sports. I hear that claim against everything I actually lived.

Thirty years ago, in United States v. Virginia, the Supreme Court held that generalizations about “the way women are” cannot justify denying opportunity to women whose talent and capacity place them outside the average description. That principle didn’t just build my generation of athletes. It built a generation of women: the litigators and judges, the surgeons, the CEOs and entrepreneurs, the senators and governors, the police officers and firefighters and fighter pilots, the women who were the first of everything. Every one of those doors was held shut by the same argument Virginia made: Most women wouldn’t want this, most women couldn’t do it.

Women of my generation didn’t fight to be seen as individuals—as athletes, as leaders, as whatever they had it in them to be—only to watch that principle eroded now, in their name and over their objection.

More than half a century ago, this country decided that girls who had been told they didn’t belong on the field belonged there after all. I got to live the proof of that promise. The work now is to keep that promise for every kid who wants to play.