Vijnana Bhairava Tantra
ईदृशेन क्रमेणैव यत्र कुत्रापि चिन्तना । शून्ये कुड्ये परे पात्रे स्वयम् लीना वरप्रदा ॥ ३३ ॥
In this way, wherever there is mindful awareness, either on the void, or on another (object such as a) wall, or on an excellent person (such as guru), gradually the boon of absorption into the self is granted.
english translation
IdRzena krameNaiva yatra kutrApi cintanA । zUnye kuDye pare pAtre svayam lInA varapradA ॥ 33 ॥
hk transliteration by Sanscript