華嚴法界玄鏡 1.28

1.28

觀曰：四、色即是空。何以故？凡是色法必不異真空，以諸色法必無性故，是故色即是故。如色空既爾，一切法亦然，思之。

The Contemplation states: "Fourth: Form is emptiness itself. Why is this? Any dharma that is form must not be different from true emptiness, because all form dharmas are necessarily devoid of nature; therefore form is emptiness itself. Since it is so for form and emptiness, all dharmas are likewise; reflect upon this."