Absolute does not exist. Nothing is everlasting, stable, final. Everything is transient, relative and surmountable. Contemporary man needs to understand that such is the reality surrounding him and that he must go with the time and adjust his life to it. Science is a powerful means of achieving such a result, because it grants a better life, can fight pain, gives new value to pleasure, helps to overcome the fear of dying. The essence of this book is an epistemology and an ethics which are consistent with our times.