God has told us everything necessary for faith. However he has not told us everything there is to know.
Jesus didn’t enter the water because he was sinful; he entered the water because John was sinful, as are we all.
To not speak of hell is also to forget or ignore the great benefits of Christ and his saving work.

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If man can save himself, what need is there for the cross or the Gospel?
Such faith is faith alone. Even our Spirit-produced fruit is not to be trusted. Rather, faith rests entirely in Christ’s work for us.
Luther’s theology lets the believer in Christ dwell under the cerulean sky of God’s unchanging grace.