Continuing to look at famous teachings about meditation to support confidence in your search for the answer. The Buddhist Pali Cannon is the Tripitaka/3 baskets. The 2nd basket has the teachings/suttas and is divided into 5 collections/nikayas. The Anapanasati sutta is in the 2nd “middle-length”/majjihma collection: number 118 out of 152 suttas. So the reference is MN118 (Majjihma Nikaya #118). In these 4-pages, you can see the Four Foundations of Mindfulness (i.e. four frames of reference) discussed as well: body, feelings, mind, mental qualities. The Satipathana sutta (MN10) is similar to the Mahasatipathana sutta (DN22 = “digha nikaya” = long collections #22), and actually goes over anapanasati as well. So the two are very much interwoven, just written in slightly different words. Sensei summarized the Satipathana sutta nicely in his book Wakeful on pp 30-32 where we apply 4 steps to each of the foundations/frames: 1) clear perception (attained through practicing meditation), 2) observation (over a long period of time), 3) tranquilization, 4) liberation. The way I like to put it is from Patanjali’s Yoga sutras. We learn to quell the waves that represent disunity, disharmony or irresolution in each of the koshas/foundations/skandas/or however you care to divide yourself, during meditation AND throughout our life.
Also: a nice NPR story on perceptual time versus time as we look through memories based on work by a neuroscience professor. Same as Sensei’s subjective and objective time. Sensei coined the term “absolute time” as that which is experienced in jhana when we are fully present.