This is the essence of Marxist-Leninist philosophy (MLP). Generations of tertiary students in the Soviet Union were taught with this concise yet comprehensive textbook, written by a big collective of the best Soviet philosophers.The first part of the book is of particular value: dialectical materialism is nowadays completely ignored in the West, yet it is namely the source of the whole MLP. It is instrumental for upbringing the integrity of scientific world-view on the Universe, Humanities, society and mind. The book is definitely propagandistically engaged but it does not require to follow some concrete political slogans which are easily recognizable and do not prevent to absorb the everlasting breathtaking spirit of the omnipotence of the Titans of philosophical thought.