+~
+ Direct perfect enlightenment [with regard to] all aspects,
+ and abandonment of the stains along with their imprints
+ [are called] buddha and nirvana respectively.
+ In truth, these are not two different things.
+ —Arya Maitreya
+
+All aspects of the knowable—all absolute and relative phenomena—are
+directly known. Through this knowledge one is immediately and perfectly
+enlightened. This is the aspect of realization. All the adventitious
+defilements—the two veils along with their remaining imprints—are
+abandoned without any exception. This is the aspect of abandonment. These
+two qualities have been led to ultimate perfection. They are therefore named
+"perfect buddha" ["perfectly awakened and expanded"] from the
+viewpoint of the former aspect, and "nirvana" ["gone beyond any torment
+and pain"] from the viewpoint of the latter aspect. These two aspects are
+contained in one and the same meaning, the meaning of the tathagatagarbha,
+whereas a difference only lies in the convention of the different terms. In
+the sense of the absolute field of experience of the noble ones' primordial
+wisdom the qualities of realization and abandonment are therefore completely
+inseparable and do not exist as two different things.
+ -- Arya Maitreya, "Buddha Nature: The Mahayana Uttaratantra Shastra with
+ Commentary", with commentary by Jamgön Kongtrül Lodro Thaye
+~
+ "Vehicle" (yana) has two meanings: the means by which one progresses and
+the destination to which one is progressing. Mahayana in the sense of the
+vehicle by which one progresses means to be motivated by the mind of
+enlightenment—wishing to attain highest enlightenment for the sake of all
+sentient beings, one's objects of intent—and means to engage in the six
+perfections.
+ Seeing reason and need, Buddha set forth many systems and vehicles, but
+these did not arise due to his being intimate with some and alien to others.
+The trainees who were listening to his teaching had various dispositions,
+interests, and abilities, and thus he taught methods that were suitable for
+each of them. For those who temporarily did not have the courage to strive
+for Buddhahood or who did not at all have the capacity of obtaining Buddhahood
+at that time, Buddha did not say, "You can attain Buddhahood." Rather, he
+set forth a path appropriate to the trainees' abilities. Buddha spoke in
+terms of their situation, and everything that he spoke was a means of
+eventually attaining highest enlightenment even though he did not always say
+that these were means for attaining Buddhahood.
+ Since the purpose of a Buddha's coming is others' realization of the
+wisdom of Buddhahood, the methods for actualizing this wisdom are one vehicle,
+not two. A Buddha does not lead beings by a vehicle that does not proceed to
+Buddhahood; he establishes beings in his own level. A variety of vehicles are
+set forth in accordance with temporary needs.
+ -- H.H. the Dalai Lama