By the very act of looking

they are missing ‘That’

which is already the closest thing

Dasbodh 1.5.4

Tom’s comments:

Dasbodh, written by Sri Samartha Ramdas in 1654, has been long used as a source text for seekers of enlightenment within the Advaita Vedanta tradition. Nisargadatta Maharaj’s lineage, the Inchegarei Sampradaya, were hugely inspired by this text and Nisargadatta used to regularly read from it.

Here Samartha Ramdas is pointing us to something very profound, yet very simple once realised. For more, compare this verse with that of Zen master Han-Shan here.