However, according to Nagarjuna, even the very schema of ultimate and conventional, samsara and nirvana, is not a final reality, and he thus famously deconstructs even these teachings as being empty and not different from each other in the MMK where he writes:The limit ("koti") of "nirvāṇa" is that of "saṃsāra"The subtlest difference is not found between the two.According to Nancy McCagney, what this refers to is that the two truths depend on each other; without emptiness, conventional reality cannot work, and vice versa.