I have a special definition for the word "nature." To me, it is the set of laws which governs the universe. From the birth of the little blade of grass to the explosion of a supernova, the rules governing the creation, the development, the decline and the destruction of all things are parts of nature. From the unfoldment of the finest thought to the eruption of the most massive volcano, the laws equally apply on material as well as on subtle levels. so in order to lead a harmonious life, it is better to know these rules.