From Francis A. Schaeffer in A Christian Manifesto:
True Spirituality covers all of reality. There are things the Bible tells us as absolutes which are sinful–which do not conform to the character of God. But aside from these the Lordship of Christ covers all of life and all of Life equally. It is not only that true spirituality covers all of life, but it covers all parts of the spectrum of life equally. In this sense there is nothing concerning reality that is not spiritual.
Related to this, it seems to me, is the fact that many Christians do not mean what I mean when I say Christianity is true, or Truth. They are Christians and they believe in, let us say, the truth of creation, the truth of the virgin birth, the truth of Christ’s miracles, Christ’s substitutionary death, and His coming again. But they stop there with these and other individual truths.
When I say Christianity is true I mean it is true to total reality–the total of what is, beginning with the central reality, the objective existence of the personal-infinite God. Christianity is not just a series of truths but Truth–Truth about all of reality. And the holding to that Truth intellectually–and then in some poor way living upon that Truth, the Truth of what is–brings forth…personal results.