Complete abandonment of desires (vasana, mental conditioning) is called the best state of liberation (moksha) and is the only pure step towards happiness. The absence of desires leads to the extinction of mental actions, in the same manner as the absence of cold melts small particles of ice. Our desires uphold our living bodies and bind us tightly to our bodily prison like ropes. These being loosened, the inner soul is liberated. Mental conditioning is of two kinds: pure and impure. The impure ones cause reincarnation, while the pure ones serve to destroy it. An impure desire is like a mist of ignorance, the stubborn feeling that one is the individual ego. The wise say that individual ego is the cause of rebirth.