וָ֭אֹמַר אַךְ־חֹ֣שֶׁךְ יְשׁוּפֵ֑נִי וְ֝לַ֗יְלָה א֣וֹר בַּעֲדֵֽנִי׃
And if I say: ‘Surely the darkness shall envelop me, And the light about me shall be night';
Read kabbalistic (mystical) interpretation of Psalms 139:11: and classical mystical sources.