 In this passage, Kamalaśīla draws a distinction between the cognition of blue and the feeling of love. His point is that the cognition of blue is a perception and therefore requires an object whereas a feeling of love does not. There is no basis for love in the way that there is a basis for our perception of blue. So, Śāntarakṣita’s argument, as explained by Kamalaśīla, consists of two parts: a) love, hatred etc. are learned through experience and reinforced by repetition and b) love, hatred etc. are not perceptions.