Grudem on why we should study theology with prayer

From pages 32-33 of Systematic Theology

Paul tells in 1 Corinthians 2:14 that "the unspiritual man does not receive the gifts of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned." Studying theology is therefore a spiritual activity in which we need the help of the Holy Spirit.

No matter how intelligent, if the student does not continue to pray for God to give him or her an understanding mind and a believing and humble heart, and the student does not maintain a personal walk with the Lord, then the teachings of Scripture will be misunderstood and disbelieved, doctrinal error will result, and the mind and heart of the student will not be changed for the better but for the worse. Students of systematic theology should resolve at the beginning to keep their lives free from any disobedience to God or any known sin that would disrupt their relationship with him. They should resolve to maintain with great regularity their own personal devotional lives. They should continually pray for wisdom and understanding of Scripture.

Since it is the Holy Spirit who gives us the ability rightly to understand Scripture, we need to realize that the proper thing to do, particularly when we are unable to understand some passage or some doctrine of Scripture, is to pray for God's help. Often what we need is not more data but more insight into the data we already have available. This insight is given only by the Holy Spirit (cf. I Cor. 2:14; Eph. 1:17-19).