Isaiah 41:21

Produce your cause. — The scene of Isaiah 41:1 is reproduced. The worshippers of idols, as the prophet sees them in his vision hurrying hither and thither to consult their oracles, are challenged, on the ground not only of the great things God hath done, but of His knowledge of those things. The history of Herodotus supplies some striking illustrations. Crœus and the Cumœans, and the Phocæans, and the Athenians are all sending to Delphi, or consulting their seers, as to this startling apparition of a new conqueror.

Your strong reasons. — Literally, bulwarks, or strongholds. So we speak of impregnable proofs.