頓悟入道要門論上曰：「汝若欲了了識無所住心時，正坐之時但知心，莫思量一切物。一切善惡，都莫思量。過去事已過去，而莫思量。過去心自絕，即名無過去事。未來事未至，莫願莫求，未來心自絕，即名無未來事。現在事已現在，於一切事，但知無著。無著者，不起憎愛心，即是無著。現在心自絕，即名無現在事。三世不攝，亦名無三世也。心若起去時，即莫隨去，去心自絕。若住時亦莫隨住，住心自絕，即無住心即是住無住處也。若了了自知住在住時，只物住亦無住處，亦無無住處也。若自了了知心不住一切處，即名了了見本心也，亦名了了見性也。只個不住一切處心者，即是佛心，亦名解脫心，亦名菩提心，亦名無生心，亦名色性空，經云證無生法忍是也。」
The mind without resting-place, i. e. detached from time and space, e. g. the past being past may be considered as a 'non-past' or non-existent, so with present and future, thus realizing their unreality. The result is detachment, or the liberated mind, which is the Buddha-mind, the bodhi-mind, 無生心 the mind free from ideas of creation and extinction, of beginning and end, recognizing that all forms and natures are of the Void, or Absolute.