Sheryl Weikal"Joy is resistance" (and I'm paraphrasing) was used by Emma Goldman to mean that we should live happily in spite of oppression, not as an excuse to do things that enrich and empower oppressors. The whole point was to dance at the revolution, not pay the oppressors to take dance classes.
Levka"Joy doesn't betray but sustains activism. And when you face a politics that aspires to make you fearful, alienated and isolated, joy is a fine act of insurrection." -- Rebecca Solnit, *Hope in the Dark*