In "Science and Health with Key to the Scriptures" Mary Baker Eddy writes (p.202), "The scientific unity which exists between God and man must be wrought out in life-practice, and God's will must be universally done." We are not left in doubt or perplexity as to how this great work is to be accomplished; we are told plainly in her book "Pulpit and Press" (p.4), "You have simply to preserve a scientific, positive sense of unity with your divine source, and daily demonstrate this." A scientific sense of unity is based upon the recognition of divine law, and is, therefore, not emotional or vacillating, but true and indestructible; it is natural and God-given, and our daily work is to preserve it by realizing the inexhaustible nature of the divine source.
To preserve is to shield, to guard from harm or corrupting influence, that which is precious. A scientific sense of unity with the source of our being is our most precious possession, and surely we should preserve it from harm.
Our city water supply is guarded at its intake, lest anything contaminative should enter and impair its purity. We should guard our thoughts far more carefully, lest our sense of our divine source be polluted with materiality. Of course, the divine source is never touched with evil, since nothing exists that could ever contaminate divine purity. But we have to realize this, and then we see that the source of all being remaining pure, all that springs from divine Love is likewise pure.
