> 
> Why be afraid of savage dogs if you can’t be sure they want to hurt
>  you? Just because they’re barking and baring their teeth and running
>  towards you doesn’t mean they’ll definitely bite. And even if they do,
>  it won’t necessarily hurt. Why care about oncoming traffic when you
>  cross the road? Those carts might not hit you. Who really knows? And
>  what difference does it make if you are alive or dead anyway? Somehow
>  Pyrrho managed to live out this philosophy of total indifference and
>  conquer all the usual and natural human emotions and patterns of
>  behaviour.
> 
> 
> 

I find the last sentence is too complex to understand.

Which noun does **usual and natural** modify? "human emotions" or "patterns of behaviour" or both of them?