Dagg Manual of Theology is a theology work in 2 volumes by J.L. Dagg a Reformed Southern Baptist. It is an extensive, very ample presentation of doctrines.
This is an extensive Bible Systematic Theology (Bible Doctrines book) from a conservative point of view.
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Divine use of Sickness CP34 Divine use of Sickness
Read this tract by Pastor Cox about the divine use of sickness explains how God works with sickness to remind man of his limited time on earth, the consequences of sin, etc.
In this tract Pastor Cox explains how God positively uses sickness to help us turn our thoughts and attention to the eternal. We get so involved in our daily lives sometimes that we forget that our life is but a vapor on this earth, soon to no longer be. God uses sickness as a severe warning that our time is running out, and we need to live as though every moment has a forward view towards eternity. How we spend our life is important. Sections:
1. Understanding that God is God
2. Sickness because of Sin
3. Warning about approaching Death
4. Warning about Human weakness
5. The Error of the Sick
6. God listens to those who ask in sincerity

Job 13:15 Though he slay me, yet will I trust in him: but I will maintain mine own ways before him.

There is an attitude within much of Christianity that sickness in any form is bad, and God does not have anything to do with it. For these Christans, they ask God to take the sickness away, and sometimes (as though it was their right to be health) that they demand God to remove their sickness. The reality of life is that they continue ill, and many have a crisis of faith over this. For them, God is impotent, or God does not love them. In other words, their confidence, faith, and love of God depends on God always sending them good things. But this is not how the Bible indicates life is. God uses calamity and sickness for His own purposes and we have to understand this (and accept it).