לָכֵ֛ן יֵדַ֥ע עַמִּ֖י שְׁמִ֑י לָכֵן֙ בַּיּ֣וֹם הַה֔וּא כִּֽי־אֲנִי־ה֥וּא הַֽמְדַבֵּ֖ר הִנֵּֽנִי׃
Therefore My people shall know My name; Therefore they shall know in that day That I, even He that spoke, behold, here I am.
Read kabbalistic (mystical) interpretation of Isaiah 52:6: and classical mystical sources.