Feeling of void is felt when one loses someone close to us. This void is the emptiness of love, affection, care, blessing and grace of the spirit in essence. The more one basks in the glorious love, affection, care, blessing and grace one remains connected with the spirit in essence, for the spirit in essence has nothing more and nothing less to offer.
The spirit remains eternally with those who loved them cared for them for the essence allows those in body to relate and be awakened to them. The spirit keeps talking to them, discussing with them, guiding them and also showing ways that allows those around the spirit to be for one has to realize for the spark in them is the same spark that is pulsating within everyone. This is a life long communication and allows the words to echo and be alive even after years, decades, centuries after the spirit has left the body.
The whole essence of the void is only love, affection and care. No this is not a concept of duty or Karma, nothing to do with the concept of gaining any punya (merit) for next life. It is nothing more or less than the pure love, affection and care with no selfish needs, or requirement.
One has to immerse oneself in the ocean of love and affection to be actually caring, the grace and blessing is between the spirits for the gain of wisdom of knowing the spirit allows one to become one and this oneness is a blessing emerging from the grace.
Those who love, care in hope of gaining blessing and grace are actually fooling themselves for in that looking there subtle ego is in play and when the spirit moves one, one gets on the process of doing rituals and process for the pacification of soul of the departed body. But how can one even pacify the spirit when the connection itself was at body level and even at mind level it was working through closed conditions. In closed conditions the mind is purely following the body and allows the ego to become the soul of the body and mind thus creating a way of appeasing the self-ego.
When you serve never serve with body or mind but with heart and allow the heart to make decisions and the mind to execute them thus the spirit within you becomes the soul and guides you through the way of knowing, serving and loving the spirit other than yours as yours thus the oneness emerges leading one to be completely in tune with oneself while serving irrespective of the world around.
This serving is called sewa where SE (से ) represents spirit(मानस) and VA(वा) represents Essence (सत्तव), if the spirit in essence is not there then seva to is not there. Seva is not serving but being part of the essence within the spirit that is alive through the inner eye of consciousness.