לֹ֧א בַסֵּ֣תֶר דִּבַּ֗רְתִּי בִּמְקוֹם֙ אֶ֣רֶץ חֹ֔שֶׁךְ לֹ֥א אָמַ֛רְתִּי לְזֶ֥רַע יַעֲקֹ֖ב תֹּ֣הוּ בַקְּשׁ֑וּנִי אֲנִ֤י יְהוָה֙ דֹּבֵ֣ר צֶ֔דֶק מַגִּ֖יד מֵישָׁרִֽים׃
I have not spoken in secret, In a place of the land of darkness; I said not unto the seed of Jacob: ‘Seek ye Me in vain’; I the LORD speak righteousness, I declare things that are right.
Read kabbalistic (mystical) interpretation of Isaiah 45:19: and classical mystical sources.