References – SN 36: Linked Discourses on Feelings 
Sutta / Saṁyutta Nikāya / SN 36: Vedanāsaṁyutta

SN 36.4: The Bottomless Abyss (1)

SN 36.6: The Dart (7)

SN 36.7: The Sick Ward (1) (1)

SN 36.11: Alone (1)

SN 36.21: Sivaka (2)