Self Love
The Supreme Personality of Godhead said: O Pārtha, when a man gives up all varieties of desire for sense gratification, which arise from mental concoction, and when his mind, thus purified, finds satisfaction in the self alone, then he is said to be in pure transcendental consciousness (BG 2.55)
Real pleasure does not come from things, stuff, or temporary relationships. Pleasure only comes from the self and things identified with the self. In Sanskrit this is called aham mameti (I & mine). The "I" is what actually provides pleasure. "I" is transformed into "mine" like the root of a tree extends into the stem, branches, and fruit.
When driving our own car down the road we get a flat tire, we feel very disturbed. However, when we see someone's car get a flat tire on the road, we don't feel disturbed that their tire is flat because we have not identified ourselves with that car.
Similarly, when our lover abandons us we feel great heartbreak. But when a stranger's lover abandons them, it doesn't evoke the same feelings of distress. Perhaps a friend will get their heart broken and we will feel some empathy -- but that is to the extent that we identify them as "my friend."
In this way, the I extends to mine in the forms of things and relationships in this world. Clearly, the distress we feel is not coming from these circumstances unless a level of identification due to possession is there. When our car drives well, when our love affair goes well, when our friends and family are happy -- there is our happiness, hiding within ourselves all along, tricking us as it extends out into temporary things of this world.
In this above quoted verse from the end of the second chapter of the Bhagavad Gita, Krishna describes that one situated in real knowledge cuts out the middle man -- forget the stuff, things, and temporary relationships. What about me? What about the self, the source of the apparent happiness entering in these fleeting things?
Those aspiring for transcendence are identified by their understanding of this aspect of reality. Happiness is only coming from the self. The next question that logically follows one who comes to this conclusion is: what is the self? What am I, and why am I the only thing in this world which seems lovable?