Through selfless service you realise that all beings are waves of the Ocean of Divinity. No other sadhana (spiritual practice) can bring you into the incessant contemplation of the Oneness of all living beings. You feel another's pain as your own; you share another's success as your own. To see every one else as yourself and yourself in every one, that is the core of the sadhana of seva. Again, seva makes the ego languish for want of food. It makes you humble before the suffering of others, and when you rush to render help, you do not calculate how high or low his social or economic status is. The hardest heart is slowly softened into the softness of butter by the opportunities that the seva offers.

-Divine Discourse, November 14, 1975.

Hands that serve are holier than the lips that pray.  Baba