Spinoza was convinced that the whole world is a mathematical system and can be fully understood in a geometric way. His philosophical system begins with initial assumptions and, with the help of geometric proofs, builds the Universe, which is also God. This is a classic example of pantheism. Such views echo the modern theory, according to which our planet is viewed as one huge organism, or a self-regulating system. In the book, the reader will find a brief overview of the life and ideas of Spinoza, excerpts from his works, dates of the most important events in the life of the philosopher and the history of his era.