There are many definitions for robustness and resilience. I have my favourites.
Robustness is surviving unchanged. Resilience is surviving changed.
There must be a balance. If you are robust, but not resilient, you’ll crash when the pressure grows too high. If you are resilient, but not robust, you’ll have to change constantly - and run out of fuel.
If you are robust enough for periods of relative stability, and then resilient enough to change regularly, you’ll succeed.