In Bhagwad Gita, it says - "if you don't fight you will lose your honour and people will talk about it for _ages_". 
  
- Now why would one care about 'honour' if all things seen an illusion!? 
- Fighting for 'honour' implies having an 'ego' - and doesn't one have to rid ego to know 'the truth' and rise 'above' the illusion? 
- Why is he being told to fight, instead to 'meditate' and think that all that's happening around him an 'illusion' created  by the power 'Maya' with the help of 'ego'?