“The most important thing in the world is…”  There are as many answers to this as there are people in the world.  For Mary Baker Eddy, who was fond of asking this question of her students, the answer was clear: knowing God.  She wrote and revised her major work, Science and Health with Key to the Scriptures, over the course of 38 years.  Obviously, “God” is a big subject, and it’s no secret to readers of her book that writing about God is her favorite topic.

God is Love. Can we ask Him to be more? God is intelligence. Can we inform the infinite Mind of anything He does not already comprehend? Do we expect to change perfection? Shall we plead for more at the open fount, which is pouring forth more than we accept? (p. 2:23–28)

The Scriptures imply that God is All-in-all. From this it follows that nothing possesses reality nor existence except the divine Mind and His ideas. The Scriptures also declare that God is Spirit. Therefore in Spirit all is harmony, and there can be no discord; all is Life, and there is no death. Everything in God’s universe expresses Him. (p. 331:11)

God. The great I am; the all-knowing, all-seeing, all-acting, all-wise, all-loving, and eternal; Principle; Mind; Soul; Spirit; Life; Truth; Love; all substance; intelligence. (p. 587:5)
Human philosophy has made God manlike. Christian Science makes man Godlike. The first is error; the latter is truth. (p. 269:9–11)

Father-Mother is the name for Deity, which indicates His tender relationship to His spiritual creation. As the apostle expressed it in words which he quoted with approbation from a classic poet: “For we are also His offspring.” (p. 332:4)
In one sense God is identical with nature, but this nature is spiritual and is not expressed in matter. The lawgiver, whose lightning palsies or prostrates in death the child at prayer, is not the divine ideal of omnipresent Love. God is natural good, and is represented only by the idea of goodness; while evil should be regarded as unnatural, because it is opposed to the nature of Spirit, God. (p. 119:17)