Full Idea
We can modify our character, by putting ourselves in circumstances that will act on us from the outside, …or by the orientation of our attention in the moments that appear most insignificant or indifferent in our lives.
Gist of Idea
We modify our character by placing ourselves in situations, or by attending to what seems trivial
Source
Simone Weil (On the Concept of Character [1941], p.99)
Book Reference
Weil,Simone: 'Late Philosophical Writings' [Notre Dame 2015], p.99
A Reaction
I've never seen anyone address this question (apart from Aristotle's emphasis on training habits). Choosing your source for current affairs information strikes me as very important. What you read, what you watch, who you spend time with…