首楞嚴義疏注經 3.521

3.521

太虛處我心中，尚如片物在掌，更觀所生微質，於心大小若何？故舉空中一塵，存亡豈辨，喻至小也。如湛下再舉漚，喻了身無生也。前喻猶存小相，今喻相本無生，故此二喻各顯一意。

Vast space is within my mind yet is like a small object in the palm; when one further looks at the minute substance of what was born, how does its size compare to the mind? Therefore it cites a single speck of dust in space, whose presence or absence can hardly be discerned, as a simile for the utmost smallness. From 'like a serene' down, it again cites a bubble as a simile for understanding that the body is fundamentally unarisen. The former simile still retains the aspect of smallness, while the present simile shows that appearances are fundamentally unarisen; thus these two similes each illustrate a distinct meaning.