If it could be strictly isolated from the rest of his teaching, we could thank God for Calvin's firm insistence that salvation is by God's grace alone through faith alone in Christ alone.
Unfortunately, the rest of Calvin's teaching mitigates the good that this insistence does, for (in my opinion) he missed several other important Biblical truths by building a theological system that gave heavy emphasis to a consistency based on human logic instead of on the Word of God alone.
He was led to the teaching of double predestination by that, as well as to his teaching that the Holy Spirit can operate in our hearts independently of the Word - that instead of looking to the Word of God alone as the assurance of our salvation we need to examine our own feelings and experience for the evidence of the Spirit's saving work, and (what is worse) this according to criteria based on law instead of on the gospel of God's grace in Jesus. The first error is widely known to be false in our day, but many today have unknowingly fallen prey to the second.
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