Thus, whatever kind of Feeling one experiences,-pleasant, unpleasant or indifferent-one approves of and cherishes the feeling and clings to it; and while doing so, lust springs up; but lust for feelings means clinging to existence (upadana); and on clinging to existence depends the (action-) Process of Becoming (bhava, here kamma-bhava); on the process of becoming depends (future) Birth (jati); and dependent on birth are Decay and Death, sorrow, lamentation, pain, grief and despair. Thus arises this whole mass of suffering.

(Buddha Sakyamuni)