Produce your cause, saith the LORD; bring forth your strong reasons, saith the King of Jacob.
Produce your cause, saith the Lord - A new challenge to the idolaters (see Isaiah 41:1; Isaiah 41:7) to say, can their idols predict future events as Yahweh can? (Isaiah 41:22-25, etc.)
Bring forth your strong reasons - the reasons for idol-worship which you think especially strong.