I am looking for a word or term [English or another language] that summarizes the concept:
'Do not worry about what you cannot control, only worry about what you can control'
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This quote which became like a proverb might help:
We can't direct the wind but we can adjust the sails.
It is attributed to several authors, like for example, Thomas S. Monson.
It is not easy to find official definitions of this, but this site says
In this quote the Thomas S. Monson is trying to say is that most of the times we cannot control the situations but we can control our response to those situation which will decide our course in life.