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σκόπει οὖν μὴ τὸplugin-autotooltip__default plugin-autotooltip_bigὁ

greek

The definite article φῶς τὸplugin-autotooltip__default plugin-autotooltip_bigὁ

greek

The definite article ἐνplugin-autotooltip__default plugin-autotooltip_bigἐν

greek

Preposition meaning “in”. σοὶ σκότος ἐστίν.plugin-autotooltip__default plugin-autotooltip_bigεἰμί

greek

εἰμί is the first person singular verb for “to be” (εἶναι [the infinitive form] = “to be”).

It an irregular verb, and, like English, changes significantly between person and tense. For example εἰμί is the word for am and ἦν is the word for was, e.g.