Buddhist Endpoint - Nirvana / Nibbana

I found this website that write about nirvana:

QUOTE
The death of a Buddha, the great Parinirvana, is neither destruction nor death, else would it be birth and continuation. If it were destruction, it would be an effect-producing deed, which it is not. Neither is it a vanishing nor an abandonment, neither is it attainment, nor is it of no attainment; neither is it of one significance nor of no significance, for there is no Nirvana for the Buddhas.

The Tathagata's Nirvana is where it is recognised that there is nothing but what is seen of the mind itself; is where, recognising the nature of the self-mind, one no longer cherishes the dualisms of discrimination; is where there is no more thirst nor grasping; is where there is no more attachment to external things. Nirvana is where the thinking-mind with all its discriminations, attachments, aversions and egoism is forever put away; is where logical measures, as they are seen to be inert, are no longer seized upon; is where even the notion of truth is treated with indifference because of its causing bewilderment; is where, getting rid of the four propositions, there is insight into the abode of Reality. Nirvana is where the twofold passions have subsided and the twofold hindrances are cleared away and the twofold egolessness is patiently accepted; is where, by the attainment of the "turning-about" in the deepest seat of consciousness, self-realisation of Noble Wisdom is fully entered into,--that is the Nirvana of the Tathagatas.

Nirvana is where the Bodhisattva stages are passed one after another; is where the sustaining power of the Buddhas upholds the Bodhisattvas in the bliss of the Samadhis; is where compassion for others transcends all thoughts of self; is where the Tathagata stage is finally realised.

Nirvana is the realm of Dharmata-Buddha; it is where the manifestation of Noble Wisdom that is Buddhahood expresses itself in Perfect Love for all; it is where the manifestation of Perfect Love that is Tathagatahood expresses itself in Noble Wisdom for the enlightenment of all;--there, indeed, is Nirvana!

There are two classes of those who may not enter the Nirvana of the Tathagatas: there are those who have abandoned the Bodhisattva ideals, saying, they are not in conformity with the sutras, the codes of morality, nor with emancipation. Then there are the true Bodhisattvas who, on account of their original vows made for the sake of all beings, saying, "So long as they do not attain Nirvana, I will not attain it myself," voluntarily keep themselves out of Nirvana. But no beings are left outside by the will of the Tathagatas; some day each and every one will be influenced by the wisdom and love of the Tathagatas of Transformation to lay up a stock of merit and ascend the stages. But, if they only realised it, they are already in the Tathagata's Nirvana for, in Noble Wisdom, all things are in Nirvana from the beginning.
UNQUOTE