The shadow of pleasure is pain.
The shadow of eating a sinful pastry is a spike in the level of your blood sugar, followed by a crash and a craving for more sugar.
The shadow of watching your football team win is a crushing sense of defeat when they lose someday.
The shadow of a smoking habit is an increased risk of cancer and cardiovascular disease.
It isn’t possible to separate something from its shadow. And yet, at the root of much suffering is our futile attempt to do so.
Observations 
Thank you for this eye-opening perspective!
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