The aim of the previous chapter was to account for human being in terms of ens and in terms of esse. This definition let me dig somewhat deeper into the philosophical query of what we call the self or the "I". I suggeted that the self or "I" is threefold, consisting of a neurological, a subjective and a transcendent degree of this emergent self. This chapter searches to find an answer to the question whether there might be the sine qua non of human being (in terms of esse). This philosophical question is of course not new and several answers have already been given. Nevertheless, there seems to be space for yet another enquiry on the subject matter. Hence, let us look closer to what has been said and which possibilities are still open. The title of the present chapter reveals that its main topic is about experiencing and experiences; it is about human being as experiencer. I will suggest that experiencing is the sine qua non of human esse; that a human being cannot not experience.