This is the infinitive form of the fundamental Greek verb 'to be' (εἰμί), expressing existence, identity, state, or predication. In Acts 8:37 (a textually disputed verse), it appears in Philip's declaration about what it means 'to believe.' As the most basic verb of being, it functions across countless grammatical and semantic contexts. The multilingual evidence naturally uses each language's equivalent infinitive 'to be' (Spanish 'ser', French 'être', German 'sein'), the most fundamental verb in any language, expressing existence and identity.