former things - Former predictions of God, which were now fulfilled, are here adduced as proof that they ought to trust in Him alone as God; namely, the predictions as to Israel’s restoration from Babylon.
new - namely, predictions as to Messiah, who is to bring all nations to the worship of Jehovah (Isa 42:1, Isa 42:4, Isa 42:6).
spring forth - The same image from plants just beginning to germinate occurs in Isa 43:19; Isa 58:8. Before there is the slightest indication to enable a sagacious observer to infer the coming event, God foretells it.