The verse uses powerful imagery of intense passion and desire, but not for what we might expect. It speaks of a deep-seated craving that drives people to horrific acts.
The Hebrew word translated 'enflaming yourselves' (or 'burning') carries a strong sense of intense, passionate desire, often linked to sexual lust. In this context, Isaiah isn't just talking about a casual preference for idols; he's describing an all-consuming passion, a 'burning lust' for false gods.
This wasn't a mild, intellectual adherence. It was an emotional and visceral addiction. These practices often involved ecstatic rituals and sensual elements designed to provoke this 'burning' desire for the deities they served.
Think of it like this: instead of a cool, reasoned faith, this was a fervent, almost frenzied devotion that fueled their actions.