Shishrusha is the word used when refer to Church services; by extension, it could mean the order of worship of any religion, as in, you go to a place of worship for their shishrusha. In essence, thus, shishrusha has a God-centered meaning.
The one single characteristic of A Supreme Being or God is compassion. When we link it to the Dalai Lama’s mantra of compassion: Om Mani Padme Hum, the meaning becomes even clearer. Om Mani Padme Hum means ‘Hail to the jewel in the lotus’, which is a metaphor for the compassion that lies within every sentient being, or the God (read Divine) in every being. Therefore when we do shishrusha for anyone, it means we are reaching out from our core of compassion to theirs; we are serving them with loving respect as we would serve God. Again, this confirms the belief that God is in everyone; there is a spark of the Divine in everyone.