In his book entitled The Doctrine of the Word of God, John Frame states "In Scripture, subjective revelation is the Spirit's illumination of objective revelation" (36).
He goes on to explain, "Orthodox Reformed theology does not reject a subjective element in revelation, but it formulates it rather differently. In a Reformed understanding, there is both objective and subjective revelation. God reveals himself in creation and in Scripture, objectively. But that objective revelation is of no use to us unless the Holy Spirit illumines our hearts and minds. As sinners, we suppress God's revelation (Romans 1 again). It is the gracious regenerating work of the Spirit that enables us to understand, believe, and obey. So on the Reformed view, there is a sense in which revelation is not completed until it becomes subjective by the Spirit's work."