Whenever the main part of the intrinsic nature is stainless and not annulled, then this can appropriately be posited as the reasoning of the intrinsic nature . . . As for the main part of the intrinsic nature being stained, that would be for instance a sun crystal [used to produce fire by concentrating the sun’s rays] being hot to the touch. An example of the main part being annulled would be when for the deer [known as] “that which cleanses itself in fire” the main part of fire’s heat is annulled [i.e., when it is not burned although bathing in fire].

-- Rongzom Chökyi Zangpo