仁王護國般若波羅蜜多經疏 3.117

3.117

解曰：寶蓮花者，或眾寶為花，或花如眾寶，云寶花也。舊云行花，天台解云「表三賢位所修無量福慧之行」。今言蓮花，表行不染。又表能詮文字般若句偈無量，皆不染故。從此第二花成寶座。

Explanation: 'Jewelled lotus flowers' means either that the flowers are made of numerous jewels, or that the flowers are like numerous jewels; hence they are called 'jewelled flowers'. The older [version] said 'flowers of practice', which Tiantai explained as 'symbolising the immeasurable practices of merit and wisdom cultivated at the ranks of the three worthies'. Here, saying 'lotus flowers' symbolises that practice is untainted. It also symbolises that the immeasurable lines and verses of text prajñā that constitute the expressing [medium] are all untainted. Next is the second [section]: the flowers form a jewelled throne.