Very often the only way to get a quality in reality is to start behaving as if you had it already.
 C. S. Lewis, Mere Christianity (1952). copy citation

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Author C. S. Lewis
Source Mere Christianity
Topic reality quality
Date 1952
Language English
Reference
Note Adapted from a series of BBC radio talks made between 1942 and 1944
Weblink https://www.dacc.edu/assets/pdfs/PCM/merechristianitylewis.pdf

Context

“When you are not feeling particularly friendly but know you ought to be, the best thing you can do, very often, is to put on a friendly manner and behave as if you were a nicer person than you actually are. And in a few minutes, as we have all noticed, you will be really feeling friendlier than you were. Very often the only way to get a quality in reality is to start behaving as if you had it already. That is why children’s games are so important. They are always pretending to be grown-ups—playing soldiers, playing shop. But all the time, they are hardening their muscles and sharpening their wits so that the pretence of being grown-up helps them to grow up in earnest.” source