"Tsog means gathering. We gather together the things we're offering, and we ourselves gather together to do the practice. Gathering together with other practitioners, concentrating our minds into the same space, gives us great inspiration. It's much better than just doing puja alone in our own rooms. This is the Tibetan connotation of tsog.
An example from my college at Sera likens a group puja to a straw broom. You can't sweep much floor with just one straw, but when many straws are gathered together to make a broom, you can clean an entire assembly hall in no time at all. We are not as strong as distinguished practitioners such as Milarepa. He was okay by himself., we are not ready for that yet.
So it's good that we come together trying to develop single-pointedness of mind; one hundred people's minds all meeting at the same place. This becomes very powerful.
Tsog in the Tibetan tradition is a most profound method of purification, a profound way of gaining realisations. When you recite the text in English you can see how many subjects are included in the practice. The Guru Puja, for example, covers the entire path to enlightenment from beginning to end. So it can happen that in your daily meditations on the lamrim you're not making any obvious progress, then suddenly during a puja, because of the conducive atmosphere you've created, zoom! -- some realisation comes into your mind. Many people have gained realisations during a puja simply because of the atmosphere.
Normally, we push ourselves to achieve, but nothing happens because we've not made the space for something to happen. By gathering together to offer tsog we're making space. When the right space opens, zoom! - realisations come as if magnetically attracted. This is true."
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