As a matter of fact, in doing a little spot googling searching for that exact quote, which I failed to find, I see that resilience is a kind of leit motif in his thinking and speaking. He has called New Orleans a national symbol of resilience, and praised India for its resilience too.
Of course, like you, I do know what resilience means. It means the ability to bounce back, usually after adversity of some sort. What I don't know is where it originally comes from. The re-, of course, means "again" in some sense, but what is the 'silience' all about? I actually have no clue. It doesn't really connect to anything else I know. Well, unless you have a better idea, I guess it's time to take a look...
Well, well, well, if it isn't our old friend salire, "to jump, to leap", come back to haunt us. (No, not Salieri, that's a different old friend.) Sure, we are thrown off the scent by the fact that our last encounter was a -sult ending (consult, insult, result, desultory) and this is a -sil connection, neither of which sound all that much like -sal.
Whatever. I suppose all that leaping around blurs the vowels a bit. But just to be clear--
That's Antonio Salieri, the musical rival of Mozart's, who probably got a bit of a bum rap from popular history when it came to his fellow musician's death. Let's hope that if he knew the rumors, he proved resilient in living them down.