Whoever is behind our creation, it is difficult not to see that each person carries within himself a certain Plan, embedded in him and composed in the form of a riddle. There is no key to the riddle, but there are vague hints scattered here and there that it exists and, with some effort, can be solved, at least approximately.

This book consists of three books written at different times, but it is one and each of its components is part of the overall plan. When preparing the book for printing, I thought about whether to modernize the text by removing some pieces or details from it that now may seem unimportant or outdated, and adding new explanations and clarifications. But then I decided that such a retroactive correction of the text could prevent the reader from feeling the atmosphere of the time when all this was written. So let everything remain as it is