To enter the room of the Tathāgata means to have great compassion towards all living beings.

Compassion can fully cover [the whole realm] like a room providing shelter. Room should be read with the sense of “to enter.”

To wear the robe of the Tathāgata means to be gentle and patient.

“The bearing of insult” and the “forbearing” of pleasure are like a cloak protecting the body. Cloak should be read with the sense of “to put on.”

To sit on the seat of the Tathāgata means to see the voidness of all things.

Being “empty,” one is given “security.” Attainment is likened to a “throne.” Throne should be read with the sense of “to sit.” Isn’t [the Buddha] thereby benefitting beings greatly?