God grant me the serenity to accept the things I cannot change, the courage to change the things I can, and the wisdom to know the difference.
— Reinhold Niebuhr

Within you there is a stillness and a sanctuary to which you can retreat at any time and be yourself.
Hermann Hesse serene quote

Peace of mind comes from not wanting to change others.
— Gerald G. Jampolsky

The more you lose yourself in something bigger than yourself, the more energy you will have.
— Norman Vincent Peale

The more tranquil a man becomes, the greater is his success, his influence, his power for good. Calmness of mind is one of the beautiful jewels of wisdom.
— serene quotation by James Allen