Speak to the hypocrites and make him understand, lest he again declare a rebellion.

This couplet offers a cautionary piece of advice. It suggests that trying to reason with or explain things to hypocritical individuals can be counterproductive. The warning is that such attempts might not only fail to change their minds but could instead provoke them. There's a fear that by engaging, you might inadvertently encourage them to create more discord or 'incite a rebellion' once again. It implies that sometimes, it's wiser to leave insincere people undisturbed to prevent further trouble, as confrontation might just fuel their disruptive tendencies.