If everything you say is a lie, then the statements ‘everything you say is a lie’, and ‘you always tell the truth’ are both lies. Which means the first statement could be that some things you say are lies and you always tell the truth is one of those lies.
Imagine trying to ward off a genie by yelling: “THIS STATEMENT IS FALSE!”
EVERYTHING I SAY IS A LIE, I ALWAYS TELL THE TRUTH!
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If everything you say is a lie, then the statements ‘everything you say is a lie’, and ‘you always tell the truth’ are both lies. Which means the first statement could be that some things you say are lies and you always tell the truth is one of those lies.