Can you find a single living cell anywhere in the universe idle for a single moment? Impossible. At the level of the atom,or even sub-atomic particle level, or any other gross levels, even the non living matter is constantly on the move.
Action, or Karma, is the unique characteristic that divides the Universe into countless individual parts, each functioning at its individual level , performing its designated karma incessantly, further grouping with other parts of the universe to function at gross levels, at grosser levels, and at further (bigger) grosser levels and finally integrating at the universe level to join an unfathomable cosmic dance.
Action is at the root of all change and change is the only constant in the tangible world.
It is true at the gross level of human beings as well. We are always performing some action or other. We can never be action-less. Our whole life is a leap from one action to another at every moment. At grosser levels, we are part of the cosmic dance.
But, we, as human beings, are unique, in the sense that we are capable of understanding our part of this cosmic dance and enjoying the same. Also, the creator has given us the unique capability of choosing our Karma.
Why are so many good and bad events happening to us, without our seeking them? You must have wondered many times. Why?
Bhagavad Gita, is an absolute, scientific Text - and it would be wrong to classify it another Religious Text.
Krishna's exhortation at this point is to make all human beings, perform their actions with utmost courage and excellence.
Do not grieve over them. Do not grieve over those who are dead, or those who are alive and going to die.(vs.2.11) This has great relevance for excellence in action.
V.2.48 precisely focuses on this, and says, you must leave out your selfishness and of your near and dear, in which case, your actions will get upgraded from Karma to Karma yoga, or excellence in action.
How many brilliant students lose their exams or get lower marks simply because of sensual pleasures and distractions? Brilliant Golfers, cricketers and footballers spoil their careers because of the same reason.
If you are not progressing in any of your goals, look for the sensual distractions which are your major obstructions.Control these and your success rate will be much better. Your distractions are basically arising from your own LIKES and DISLIKES. Beware of them. They wont allow you to see the truth.(vs.2.64).