'Citta' Bua observes the essential enduring truth of the sentient being as constituted of the indestructible reality of the citta (heart/mind). He has stated that as long as there is a nucleus of a Know-er (i.e. a 'self or Self' that knows) or nucleus of knowing-ness, the citta is not free. This nucleus is the 'Ultimate Danger' because of its alluring radiance that causes attachment.The nucleus of a Know-er within the citta, by extension, also makes the citta the Ultimate Danger because it is still not free of all defilements. The Ultimate Danger disguises itself as the Ultimate Virtue. The nucleus within the citta has many aspects, all of which are subject to being known and therefore subject to change. Upon being known, the known aspect of the nucleus ceases and another takes its place. When the perception of anatta (not-self) is applied to this nucleus, the agitated citta becomes calm and impassive with no interest in either atta (self) or anatta (not-self). At this moment, the perception of anatta causes the nucleus of the Know-er and knowing to 'flip over', and upon being let go it is totally destroyed, along with the ignorance that causes beings to wander in samsara. This citta, which is intrinsically bright, clear, and aware, gets superficially tangled up in samsara but ultimately cannot be destroyed by any samsaric phenomenon. Although Bua is often at pains to emphasise the need for meditation upon the non-Self (anatta), he also points out that the citta, while getting caught up in the vortex of conditioned phenomena, is not subject to destruction as are those things which are impermanent, suffering, and non-Self (anicca, dukkha, anatta). The citta is ultimately not beholden to these laws of conditioned existence. The citta is bright, radiant, and deathless, and is its own independent reality. The fundamental problem that besets human beings, according to Bua, is that they have taken fake and false things as their true self and lack the necessary power to be their 'own true self'; they allow the wiles and deceits of the mental defilements to generate fear and anxiety in their minds. Fear and anxiety are not inherent within the citta; in fact, the citta is ultimately beyond all such things and indeed is beyond time and space. But it needs to be cleansed of its inner defilements (the kilesas) before that truth can be realised. Bua goes on