The Bible is the basis of Mary Baker Eddy’s teachings and Science and Health with Key to the Scriptures is Eddy’s primary work and the definitive textbook on Christian Science. They are the best sources for a deeper understanding of Christian Science.
Mary Baker Eddy provides a "brief exposition of the important points, or religious tenets, of Christian Science" (Science and Health: pp.496-497) in both Science and Health and the Church Manual (pp. 15-16). The tenets are as follows:
1. As adherents of Truth, we take the inspired Word of the Bible as our sufficient guide to eternal Life.
2. We acknowledge and adore one supreme and infinite God. We acknowledge His Son, one Christ; the Holy Ghost or divine Comforter; and man in God's image and likeness.
3. We acknowledge God's forgiveness of sin in the destruction of sin and the spiritual understanding that casts out evil as unreal. But the belief in sin is punished so long as the belief lasts.
4. We acknowledge Jesus' atonement as the evidence of divine, efficacious Love, unfolding man's unity with God through Christ Jesus the Way-shower; and we acknowledge that man is saved through Christ, through Truth, Life, and Love as demonstrated by the Galilean Prophet in healing the sick and overcoming sin and death.
5. We acknowledge that the crucifixion of Jesus and his resurrection served to uplift faith to understand eternal Life, even the allness of Soul, Spirit, and the nothingness of matter.
6. And we solemnly promise to watch, and pray for that Mind to be in us which was also in Christ Jesus; to do unto others as we would have them do unto us; and to be merciful, just, and pure.
Lectures explain what Christian Science really is, its relation to the Bible, and how it applies to life in the 21st century. You can find a lecture to attend near you or listen to some online lectures.
This document is not an official "teaching" of Christian Science, but it is a synopsis of Christian Science understanding. Its specific purpose is to answer questions arising mostly from fellow Christians in an ecumenical context.