People can refer to sutta’s that describe citta as changing rapidly, arising, ceasing. Oke, that can.
But this only proofs that Maha Boowa describing his realisation used the word citta in a very different context and meaning.
He used it here in a very specific context, namely: the unique, personal, local perspective, a private perspective on the world, a perspective from which we see beings, houses, moutains etc, can totally collapse. It is anicca too. It is caused. It is produced, a result of many conditions. It can cease while one does not cease. If this local perspecive collapses, he teaches, then the citta reveals itself. A totally different perspective on what knows now reveals itself. As i read it: knowing reveals itself as being everywhere present, not local. It cannot be seperated from emptiness too. Then there is no this world or another world, no coming and going etc.
So, i think it means: what we experiences as local, as arsing, ceasing is not really local, arising and ceasing. But this remains hidden for us being trapped in a time and space bound perspective.
Anyway, i do not know all this, but what i know it that it is useless to compare the sutta’s use of the word citta with how Maha Boowa uses this word it in this very specific context of realisation and the collapse of a personal and local perspective.