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However, without attaining the stage of either Hearer (Shravaka), Solitary realizer (Pratyekabuddha) or enlightened Buddha, there is no other approach to liberate oneself from the cyclic world. Anyhow, both the Shravaka and Pratyekabuddha are the disciples of the Budhha who followed the teaching of the lesser vehicle. In the former case they listened to the teaching and taught it to others. Similarly, in the second case having heard the teaching they went off and obtained a to realization in solitary practice.
Among Shravaka, Pratyakabudha and enlightened Buddha, the former two perform only for self benefit and self liberation. So as they haven’t fully abandoned and attained the field of acceptance and rejection, once again they have to follow the path of Mahayana to attain the status of Buddha or enlightenment. Thus without following the path of Mahayana there is no alternative to achieve the enlightenment. Thus generating the mind of altruism is the single entrance to the path of Mahayana.
Bodhisattva is someone who has generated the true mind of enlightening himself for the sake of other sentient beings’ liberation from suffering and practicing of the ten perfections. Similarly, all the former Bodhisattva were had enlightened by crossing this approach. So the foremost thing to rescue self and others from being immersed in immersing from the ocean of suffering is to generate the mind of altruism which with is the thought of Bodhisattva.
To engage in the path of Mahayana, we have to train our mind about the four immeasurables, arousal of the mind for enlightenment and training of aspiration and engagement for the liberation of all sentient beings.