7. εἰ δὲ. The difficulty is restated more fully and is shown to imply the principle that ‘the end justifies the means’; and that is a reductio ad absurdum of the argument.
ἐν τῷ ἐ. ψ. = in the fact of, or by, my lie.
ψεῦσμα. Only here = acted lie, falseness to trust, etc.
ἐπερίσσευσεν. The aor. used for a single typical case.
ἔτι, after that result. κἀγὼ, just I, whose conduct has led to that result.