"Deal with the Devil if the Devil has a constituency - and don't complain about the heat"

This quote by C. J. Cherryh recommends that sometimes in life, we might have to make handle individuals or entities that we may not necessarily concur with or like. The expression "Deal with the Devil" is often used to explain negotiating with someone who is deceitful or untrustworthy. Nevertheless, the 2nd part of the quote, "if the Devil has a constituency," suggests that even the Devil has followers or fans who may benefit from the deal. The last part, "don't grumble about the heat," might be interpreted as a cautioning to not complain about the effects or unfavorable elements of the offer, as we understood the possible threats when making it. Overall, this quote advises us to be cautious and mindful of the decisions we make, even if it implies handling someone or something we might not always concur with.