The highest perfectional work of charity is to give people in general immunity from the anxieties of material existence. This can be done only by performing activities in devotional service to the Lord. Such knowledge is incomparable. Cultivation of the knowledge in the Vedas, performance of sacrifice, and distribution of munificent charities all together cannot form even a part of the immunity from the pangs of material existence that is gained from devotional service. The charity of Maitreya not only will help Vidura, but, due to its universal nature, will deliver all others in all times. Thus Maitreya is immortal.
Reference:-SB 3.7.41
