Serenity usually isn't in your comfort zone. In fact, to grow and improve your serenity, you must exit your comfort zone. Serenity follows the Law of Growth.
Many confuse serenity with apathy. In some very meaningful ways, these attitudes are opposites.
In the middle of a crisis:
Apathy means you don't care about it and you don't think about it.
Serenity means you care. And you care about it so much as to realize that if you lose your head, or focus on anything other than the best solution, then the problem won't get solved, and will likely get worse.
In the landscape of peace:
Apathy makes you disconnected and keeps you from plunging deeply into the tranquility of peace.
Serenity allows you to absorb and be absorbed into the pure bliss of the gratitude of the moment of rest.
In the face of a challenge:
Apathy brings a coldness that can make the heart and mind blind to the details of how to rise to a challenge. Perhaps even so blind as to miss that there is a challenge.
Serenity keeps the fires of desire alive to pursue the goals that must be attained to meet the challenge.