An Apparent Contradiction

Zen monks look within, work on the self and practice acceptance whereas revolutionary socialists look without, act in society and practice resistance. These two ways of life are not only entirely dissimilar but also apparently contradictory. However, I believe that:

reality is one, therefore both "inner" and "outer";
both work on the self and action in society are necessary;
acceptance and resistance have to be two sides of a single coin.

We accept some aspects of reality but change others. Thus:

we accept that we need food but have changed the ways that we produce it;
we accept the law of gravity but have learned how to fly.

Inwardly, accept and let go of a personal past.
Politically, understand and resist current oppression.
We are Arjuna and the class struggle is the battlefield of Kurukshetra.