首楞嚴義疏注經 1.424

1.424

此下皆諮求法要恭敬之儀也。梵漢兩儀，聽眾咸坐。欲有請問，從座而作如禮請益則起，更端則起，將有承聽，必須復坐。經有退坐一面，儒有居與汝言，皆令攝儀受法無謬也。言座起者，從法空體起悲濟用也。

From here down are all the reverent rituals for consulting and seeking the essentials of the Dharma. In both Indian and Chinese etiquette, the listening assembly all sit. When wishing to ask a question, they arise from their seats: to formally request instruction one arises, and when changing the topic one arises; when about to receive and listen, one must sit down again. Sūtras have 'withdrew to sit at one side', and the Confucians have 'sit, and I shall speak with you'; both cause deportment to be collected so that the Dharma is received without error. Speaking of 'arising from the seat' means arising from the substance of dharmic emptiness to engage in the compassionate activity of saving [others].