Everything in this Universe is connected one to the others. The salvation of earth for example is subject to the safety of Mars and other planets. It also depends on the safety of the Sun, the Moon etc. This means the safety of human being depends on anything else in the Universe.
It seems to be 'selfish' if man is only praying for himself, for his family or only for other human being. This also has been making human become egoistic. They love their family but hating other families, they love human but hating animals, they only love their clan and undermining other clans. For the sake of their own compatriots, they colonize and slave others. What a sad understanding of life?
Without water we won't exist, without Sun there's no chance for us to live, without plants we can't breathe. Have we thanked all those sources of our lives in every second we realize that this good life is only a grace?
In Bali for example people do offerings and chant certain Mantra for the salvation of Universe and all its contents. They are praying for the transcendent Universe, not only for observable Universe but also inscrutable Universes and all the contents. They understand that if Universes are safe, their lives are safe. By understanding this, we will feel that we all are united in the Universe. We will be thanking to our mother earth, the sun, the air, the water, the fire, the sky, the plants, the animals, the seen and all unseen. We will be feeling happy all times because we know that we are supported all times by Universe.
This is the meaning that our wise ancestors in Bali always tell us that 'Bhuana Alit' means our body is nothing else 'Bhuana Agung' means Universe. Praying for Universe means that we have prayed for everything includes ourselves, our families, our communities, the whole time-space and all its contents. If we pray only for ourselves and our families, the energy returned to us will be as small as ourselves and our families. If we pray for the Universe, the energy returned to us will be as big as Universe. Those who have understood this will always feel safe anytime-anywhere, in the mundane world and in spiritual world.