An excerpt I wrote from a conversation between myself and Parodites:
I have been devoting more time to trying to discover what pleasure and pain "are", which for me means not only how we experience them and what extant function/s they serve, individually and socially, but rather also how these have developed, and why. It is easy to trace these to survival potential and natural selection, of course. But going a bit deeper here, it seems that pleasure and pain, indeed all basic tactile sensations (of which pleasure and pain represent ends of a spectrum) arise in order to communicate a difference, a change. This is immediate at the level of the organism's biochemsitry, a sudden shift in conditions affecting cellular structure/s, which generates some sort of tactile sensation falling somewhere on the spectrum from pleasure to pain. We then elevate this to an entirely new level of experience in the mind, since we make of this awareness of difference/change an emotional order, a sensation on the level of affects. This "inner tactile" quality that we call emotions serves the very same function, to communicate a change in conditions impressing upon certain organic structures - in the case of pleasure and pain these structures are cellular/chemical, in the case of joy and suffering these structures are psychological. And of course higher level experiences of these more mental sensations also at times include degrees of the lower-order sensations of pleasure and pain.
In this way I understand what you identify here, that "pleasure has no conscience about itself"; pleasure does not require self-recognition or further contemplation. Pleasure being the sensation which identifies changes in structure that have been, over time, found to be beneficial to the organism's survival potential. I.e. that organism which feels pleasure as opposed to pain when it eats tends better to survive. This goes for all manner of sensations, and each has been forged within such an evolutionary fire -- with the possible exception of many of the affective, mental "inner tactile" sensations, although many of these probably developed in rudimentary, "violent" forms based on an evolutionary imperative, but later were refined by socialization and development of self-consciousness potential, into what we now have today as the whole spectrum of feelings and emotions. Pleasure, therefore, and sublimated mental-affective forms of joy/happiness/contentment, represent benefits which spur only the need to impress this behavior further upon the organism, which is to say, pleasure is self-reinforcing, "addicting". Whereas suffering, on the other hand, inspires an entirely different need, the need to immediately seek alteration of circumstances so as to alleviate the condition/s causing suffering. So on the level of basic cellular chemistry/neurobiology as well as on the higher-order level of self-reflective consciousness and affective-mental inner tactile sensations, suffering/pain/discomfort naturally motivate, indeed must motivate, some process of recognition, understanding, and action.
Thus is suffering a "way into" the center of consciousness, if we aim to observe those reasons why we act as we do. Pleasure adopts the form of addiction, whereas suffering the form of contemplation and further action.