I am the LORD, and there is none else, there is no God beside me: I girded thee, though thou hast not known me: I (am) the Lord, and (there is) none else - (Isaiah 42:8; Isaiah 43:3; Isaiah 43:11; Isaiah 44:8; Isaiah 46:9.)
I girded thee - whereas "I will loose (the girdle off) the loins of kings" (Isaiah 45:1), strengthening thee, but enfeebling them before thee.
Though thou hast not known me - (Isaiah 45:4.) God knows His elect before they are made to know Him (Galatians 4:9; John 15:16).