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speratus amazingly said:
How can any teaching that must be deduced from scripture through a process of human reasoning be anything more than a pious opinion? Doesn't scripture alone establish church doctrine not scripture plus human reason? Is not double predestination itself merely a human opinion with no basis in scripture alone?

Speratus have you ever read Luther's response to the Diet of Worms? Let me quote you a specific portion.
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If, then, I am not convinced by proof from Holy Scripture, or by cogent reasons, if I am not satisfied by the very text I have cited, and if my judgment is not in this way brought into subjection to God’s word, I neither can nor will retract anything; for it can not be right for a Christian to speak against his country. I stand here and can say no more. God help me.

Even Luther recognized that reason must be imployed when discerning correct doctrine. So how can you a Lutheran deny its use?

Peter

If you believe what you like in the gospels, and reject what you don't like, it is not the gospel you believe, but yourself. Augustine of Hippo