Spiritual vow.

The shravaka seeks personal liberation as an arhat and aspires to attain the bliss of nirvana. Bodhisattvas, on the other hand, vow to liberate all sentient beings before attaining their own liberation. In practicing the bodhisattva path, one does not renounce the shravaka path. In fact, the aspiration to self-enlightenment (bodhicitta) is one of the necessary elements of the bodhisattva path. The Mahayana path does not renounce the self-liberation of the shravaka. For a bodhisattva to renounce the shravaka path would be contradictory; the fourth vow of the bodhisattva is, in fact, "I vow to attain supreme buddhahood."

Of paths by which sentient beings may practice Dharma, two bring liberation:

• The shravaka vehicle, associated with Theravadan Buddhism, is the path of personal liberation; the shravaka seeks personal liberation as an arhat and aspires to attain the bliss of nirvana.
   
• On the bodhisattva path of Mahayana Buddhism one vows to liberate all sentient beings before attaining one's own liberation.