D. The faults of an impure meditation object

1. The faults of an impure meditation object

The former concerns a limited number of sentient beings. Such impure objects are causes of the Brahma-viharas.

The meditation objects of the four Brahma-viharas involve arousing these four mental phenomena, kindness and so forth, for a limited number of sentient beings, one, two, or whatever.  Here liberated mind is not achieved. One to one kindness, like that of a woman crossing the river Ganges with her child, produces samsaric causation, such as the arising of the Brahma-viharas. The Bodhicharyavatara says:

As the fruit of a clear and unified mind arising
Is Bhrama and so forth,...

2. The instruction to learn the liberating four immeasurables

Thus, with that particular awareness, as for these four immeasurables:

Since, when objectless, these are directed at liberation,
These should be trained in by those with the nature of compassion.

Those desiring liberation must train in them only in an objectless manner, in the aspect of apprehending the four immeasurables.