People say that this moment of athletic activism started with Colin Kaepernick taking that knee during the national anthem. But as Kaepernick would be the first to acknowledge, it didn’t begin with a knee; it started with the Black Lives Matter movement and the pressing need to stand up to racism and police violence.

Just as, today, you can’t talk about the civil-rights movement of the 1950s without talking about Jackie Robinson, or of the 1960s without talking about Muhammad Ali, or of the women’s-liberation movement without talking about Billie Jean King, in future years you won’t be able to talk about this new millennial resistance to racism without talking about Colin Kaepernick.

We should also remember that it’s not just what Kaepernick did; it’s what he said. When asked why he didn’t stand for the anthem, Kaepernick replied, “I am not going to stand up to show pride in a flag for a country that oppresses black people and people of color. To me, this is bigger than football, and it would be selfish on my part to look the other way. There are bodies in the street and people getting paid leave and getting away with murder.”

As the fiery Hotspur puts it in Shakespeare’s Henry IV, Part I: “tell truth, and shame the devil!” Kaepernick told the truth, but the devil doesn’t like to be shamed, and the backlash against him has been ferocious. He’s been showered with abuse by some of the most dangerous sewer-dwellers in America. And, of course, the NFL’s owners—who showered our white-supremacist president with millions of dollars—have collectively denied Kaepernick a living. Their intent, it is obvious now, was to turn him into a ghost story, a warning to other players: Don’t be like Colin or you’ll pay the ultimate price.

But instead of becoming a ghost story, Kaepernick has become an icon of resistance, and we have all seen this sports season how athletes have used their hyper-exalted, brought-to-you-by-Nike platform to say something about the world.

Still, while much of the coverage has been about professional athletes speaking out, the true resonance has been felt among our youth. High-school athletes across the US, in different sports, have taken a knee to protest the gap between the promises of this country and the lived reality of racism. This has turned the athletic field, which for so long has been either apolitical or a place of uncritical patriotism, into a site of visible dissent.

Now we live in a world where sports, of all things, have given us an arena of tenacious resistance—and, most importantly, hope in very difficult times. What Colin Kaepernick has done is retaught an old lesson to a new generation: that courage is contagious.