As in the physical being of an individual many small germs are born and nourished which are living beings, so in his mental plane also there are many beings, termed muwakkals - elementals. These are still finer entities born of man's own thoughts, and as the germs live in his physical body so the elementals dwell in his mental sphere. Man often imagines that thoughts are without life; he does not see that they are more alive than the physical germs and that they have a birth, childhood, youth, age and death. They work for man's advantage or disadvantage according to their nature. The Sufi creates, fashions and controls them. He drills them and rules them throughout his life; they form his army and carry out his desires. As the germs constitute man's physical being and the elementals his mental life, so do the angels constitute his spiritual existence. These are termed farishtas.