SN 36.22 Aṭṭhasata Sutta: The 108 Feelings
2 feelings - bodily and mental.
3 feelings - pleasant, painful, neutral.
5 feelings - faculties of pleasure, pain, joy, displeasure & equanimity.
6 feelings - coming from the eye, ear, nose, tongue, body & mind.
18 feelings - the 6 above accompanied by joy, displeasure & equanimity.
36 feelings - the 18 above based on either the household life or renunciation.
108 feelings - the 36 above in the past, present and future.