They are the last lyrics of Biko, by Peter Gabriel. The way he sings those lyrics as the song builds toward the end hits me every time I hear it. The last line is sung after a slight pause, and it sounds like a veiled threat to the leaders of South Africa that killed Stephen Biko. Also, it didn’t take a long time for change to happen in South Africa after the event, but when he wrote the song it was still several years away. So at the time it was still wishful thinking that “the wind would blow the flames higher”.