In our daily life, we get attached to action which is described as aasakti (interest or attachment) or we are detached from it - virakti (hatred or disinterested). However, Krishna refers to a third state, anaasakti (dropping both attachment and detachment) which is beyond both. He says (3.25) that the avidwan (ignorant) act with an attachment to action and the vidwan (wise) acts unattached, for the welfare of the world.
Actions based on aasakti and virakti can make us miserable. The presence of a loved one (aasakti) brings us happiness and their absence makes us unhappy. Similarly, the presence of a hated one (virakti) makes us unhappy and their absence brings relief. Hence, both aasakti or virakti are capable of swinging us between the polarities of pleasure and pain. Krishna, therefore, advises us to transcend both and be anaasakt, while performing any action.
The Welfare of the world can be equated to compassion which flows when the actions are performed with anaasakti. When actions are performed with aasakti or virakti, then it's like a garbage truck dumping dirt everywhere, thereby being welfare negative to society.
Anaasakth is like being a performer in a drama and being a part of the audience at the same time. An artist is expected to act in the role assigned to them with dedication and to the best of their abilities. To achieve this, one should keep enhancing their skills, knowledge etc. in the relevant field of action. One should simultaneously be a part of the audience in the gallery, observing the drama. While the first part is our duty in the outer world, the latter is for our inner self. While the motivation and choice of action come from gunas, it is anaasakti that should be practised while performing these actions. This when mastered, is the Gita implemented.
Performing actions without attachment is the core teaching of the Gita. It is the state of being concerned as well as unconcerned. In the physical world, one is fully concerned and does his best in the given situation. At the same time, he is unconcerned internally as the outcome of such actions won't affect him. The outcome can be in the line of efforts made or it can be completely opposite and in either case, he is neither concerned nor disturbed. This is the key to maintain a work-life balance.
Source - Daily World