Calm mind brings inner strength and self-confidence, so that's very important for good health.

Peace is the result of retraining your mind to process life as it is, rather than as you think it should be.
Inner peace is the key: if you have inner peace, the external problems do not affect your deep sense of peace and tranquility.
Peace is its own reward.
The pursuit, even of the best things, ought to be calm and tranquil.
Serenity is not freedom from the storm, but peace amid the storm.
Do not let the behavior of others destroy your inner peace.
God grant me the serenity to accept the things I cannot change, courage to change the things I can, and wisdom to know the difference.
Learn to be calm and you will always be happy.

Serenity comes when you trade expectations for acceptance.
Happiness is not a goal; it is a by-product.
Nothing can bring you peace but yourself.
The best fighter is never angry.
In the midst of movement and chaos, keep stillness inside of you.
Serenity is not the absence of conflict, but the ability to cope with it.
Anxiety does not empty tomorrow of its sorrows, but only empties today of its strength.
The greatest weapon against stress is our ability to choose one thought over another.

You find peace not by rearranging the circumstances of your life, but by realizing who you are at the deepest level.