Self Realisation or Enlightenment means direct knowledge of the Self. It is a realisation that you are impersonal awareness. This realisation takes place in the mind but may not change the unconscious mind completely since unconscious mind is programmed for several years. However, this realisation slowly changes the depth of the mind as one gets to see more clearly how thoughts arise and is therefore able to purify the mind. As mind rewires itself, the general feeling of bliss increases. When the mind steadily abides in Self, it is Self Actualisation. Self Actualisation implies happiness by default.
[Bhagavad Gita 18.54]
The above implies that the Yogi with happy mind abiding in Self neither grieves for anybody nor expects anything.
Q: When I eat chocolate I feel happy. So, does it not mean that happiness is in chocolate?
A: When a mosquito bites you, scratching the area gives you happiness. That does not mean that happiness is caused by mosquito.
There are latent desires in the causal body (unconscious mind) that create internal stresses. Some stresses can be recognised easily as they express themselves in terms of known feelings like the feeling of hunger for example. But, your mind gets used to other types of stresses and does not recognise them as stresses. But, when a stress is relieved there is a rush of happiness. This happiness comes with stress removal. It does not come from any external object. Happiness is there inside you but is clouded by stresses, the moment one stress gets removed providing some passage for the happiness to flow, it makes its presence felt. The following figure explains this with an analogy:
Another analogy can be gives using Kabir’s, “Ghoonghat ke pat khol re tohe piya milenge*” which means, “Raise the veil and you find your husband”. A newly wed traditional Indian girl covers her face by ghoonghat. She can see her husband when she opens ghoonghat. Here ghoonghat is the obstruction, husband is like happiness and the girl is the seeker.