It is outside the comfort zone that the magic happens.
Comfort is the feeling that all within a specific circumstance is as it should be. There is no need for growth, nor improvement, nor any remedial action taken to manifest increase.
Without growth, there is only death. Without increase, there is only decrease. Comfort creates feelings of ease, and is an amalgamation of the faulty perceptions of the ego; a faulty belief that one is at the peak of where they can be, or that one has bested others.
However, comfort as a phenomenon, is the creator of failure.
Those who would fall into the trap laid out by the illusions of comfort, will find themselves left behind in a desolate state of affairs; chasing the progress of others, and following instead of leading and innovating.
There is always room for improvement, where discomfort will lead the path to growth.