How to know what one must do?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

Questioner (Q): So, we were talking yesterday, you were mentioning yesterday about liberation is being disassociated with the things around and keep doing what needs to be done but not assign value to stuff in life, give too much importance, to think that there is too much to do. So, generally when one has to choose the work in his life. So, students generally are advised, “Figure out what your passion is, think about what you are so passionate about, do some work while you don’t feel it is a work — you don’t think that you are doing a job, you will do this work even you are not paid. Something you are passionate about.” So, disassociation and passion do not seem to go together. For me, I don’t see how passion and disassociation can happen together. So, if I have to choose, for example, the foundation has got a mission, PAF (PrashantAdvait Foundation) has got a mission, you have a mission, you are running, you are doing all this for so many years with a mission. I also understand that like from the example of the YouTube channel getting hacked. There could be things happening, you are disassociated to the extent that things won’t hurt you. Like you will keep going on doing your mission. So, without any passion or attachment or assigning a value. I am not able to understand, how do I choose a mission for my…