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But God hath revealed them unto us by his Spirit

Is that a "personal, private revelation"?

You also quote John Owen, but pay attention:

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The Holy Spirit does this work by teaching ‘The unction teaches you.’ This does not refer to his direct inspiration, that is, his bringing new sacred truths from God directly to the minds of men. This is how he taught the apostles and prophets (1 Pet. 1:11-12; 2 Pet. 1:21). Nor does God grant new revelations to preserve his people from error. God has made sufficient provision in his Word for that (Isa. 8:20; 2 Pet. 1:19).

Kyle

I tell you, this man went down to his house justified.