A man does not always say to himself, ‘Hullo! I’m growing up.’ It is often only when he looks back that he realises what has happened and recognises it as what people call ‘growing up’. You can see it even in simple matters. A man who starts anxiously watching to see whether he is going to sleep is very likely to remain wide awake.
 C. S. Lewis, Mere Christianity (1952). copy citation

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Author C. S. Lewis
Source Mere Christianity
Topic sleep watch
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

“I can’t.’ Do not, I implore you, start asking yourselves, ‘Have I reached that moment?’ Do not sit down and start watching your own mind to see if it is coming along. That puts a man quite on the wrong track. When the most important things in our life happen we quite often do not know, at the moment, what is going on. A man does not always say to himself, ‘Hullo! I’m growing up.’ It is often only when he looks back that he realises what has happened and recognises it as what people call ‘growing up’. You can see it even in simple matters. A man who starts anxiously watching to see whether he is going to sleep is very likely to remain wide awake. As well, the thing I am talking of now may not happen to every one in a sudden flash—as it did to St Paul or Bunyan: it may be so gradual that no one could ever point to a particular hour or even a particular year.” source