内の変化は、外への変化に。外の変化も内の変化につながることもある。
なにがきっかけとなるかなんてわからないもの。 
An inside change causes an outside change. 
Similarly, an outside change may cause an inside change.
Nobody knows what will serve as a cause.
 
Similarly, an outside change may cause an inside change.
Nobody knows what will serve as a cause.

 