10. Ye—the Jews, to whom I have given predictions, verified by the event; and in delivering whom I have so often manifested My power (see Isa 43:3, 4; Isa 44:8).
and my servant—that is, the whole Jewish people (Isa 41:8).
believe—trust in.
formed—before I existed none of the false gods were formed. "Formed" applies to the idols, not to God. Re 1:11 uses the same language to prove the Godhead of Jesus, as Isaiah here to prove the Godhead of Jehovah.