On the notion of grasping and attachment (upādāna) in the Suttas; with an emphasis on the Teaching of four specific forms of (i) clinging to and identification with sensuality (kāmūpādāna); (ii) clinging to and identification with virtue, ritual and practices (sīlavatūpādāna); (iii) clinging to and identification with views (diṭṭhūpādāna) and (iv) clinging to and identification with doctrines of a self (attavādūpādāna)