We bring to your attention a set of 23 books of the series "Spiritual Treasury." This is the ABC of spiritual life. Each Christian will find in it many important advice and instructions, and most importantly, he will understand the basics of this "science from the sciences." Combining deep knowledge of the human heart in their teachings with simplicity of presentation, the books help to understand how to correct their mental weaknesses and gradually enter the mainstream of a truly Christian life, working to cleanse the heart of harmful passions.