Saving all sentient beings
It is the core idea of ??Mahayana in Buddhism. It is just a small way to achieve enlightenment. To become a great way, you must help all living beings to achieve enlightenment. This is called "du" in Buddhism (actually Chinese Taoists also have this idea), where will we cross? In Buddhism, there is a word called "the other shore". We humans are on this shore, and the realm of Bodhisattvas and Buddhas is a large area called the other shore. The task of any Bodhisattva or Buddha is to help all sentient beings "cross" to the other side.
Please refer to Baidu Encyclopedia
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