that "the most common thing said about nirvana in Buddhist texts is that it is the ending of suffering (dukkha)." Gethin notes, "this is not a 'thing' but an event or experience" that frees one from rebirth in samsara. According to Collins, the term is also widely used as a verb, one therefore "nirvanizes." Gombrich argues that the metaphor used in the texts of flames going out, refers to fires which were kept by priests of Brahmanism, and symbolize life in the world. Nirvana is also called "unconditioned" (asankhata), meaning it is unlike all other conditioned phenomena. The cycle of rebirth and suffering continues until a being attains nirvana. One requirement for ending this cycle is to extinguish the fires of attachment (raga), aversion (dvesha) and ignorance (moha or avidya). As Bhikkhu Bodhi states "For as long as one is entangled by craving, one remains bound in saṃsāra, the cycle of birth and death; but when all craving has been extirpated, one attains Nibbāna, deliverance from the cycle of birth and death." According to Donald Swearer, the journey to nirvana is not a journey to a "separate reality" (contra Vedic religion or Jainism), but a move towards calm, equanimity, nonattachment and nonself. In this sense, the soteriological view of early Buddhism is seen as a reaction to earlier Indic metaphysical views. Thomas Kasulis notes that in the early texts, nirvana is often described in negative terms, including “cessation” (nirodha), “the absence of craving” (trsnaksaya), “detachment,” “the absence of delusion,” and “the unconditioned” (asamskrta). He also notes that there is little discussion in the early Buddhist texts about the metaphysical nature of nirvana, since they seem to hold that metaphysical speculation is an obstacle to the goal. Kasulis mentions the Malunkyaputta sutta which denies any view about the existence of the Buddha after his final bodily death, all positions (the Buddha exists after death, does not exist, both or neither) are rejected. Likewise, another sutta (AN II 161) has Sāriputta saying that asking the question "is there anything else?" after the physical death of someone who has attained nirvana is conceptualizing or proliferating (papañca) about that which is without proliferation (appapañcaṃ) and thus a kind of distorted thinking bound up with the self. In the early texts, the practice of the noble path and the four dhyanas was said to lead to the extinction of the three fires, and then proceed