>>6854484laying in your comfort zone for some time will eventually numb your feelings, forgetting what being happy really means, and missing the signs that tell you to leave it.
It's the same as if there was no night, you couldn't call the daytime "day", because there would be nothing to contrast it, all the time would be daytime. If you reman in your comfort zone, you'll always experiment conformity and in the same way forget about the sad feelings that make you move and achieve other things.
It's kinda hard to explain.