There is stillness at the core of your being. You don't have to create it, it is there waiting for you. The more you practice stillness, the more that center of calm within you will expand, until it becomes available to you any time, anywhere. This gives you the opportunity to be an observer of yourself and your world, while fully participating. This is what it means to be "in it and not of it."
You are made up of molecules and atoms. Atoms are best understood as particles and waves. Particles are still points, and waves represent motion. So your molecular makeup is stillness in motion. When you meditate regularly enough for your stillness to
expand into your activity, you have become one with your inner being, your essential self, and your spiritual nature. Learn more about meditation.
"In the midst of movement and chaos, keep stillness inside you." --Deepak Chopra
"To know yourself as the Being underneath the thinker, the stillness underneath the
mental noise, the love and joy underneath the pain, is freedom, salvation, enlightenment." --Eckhart Tolle
"When everything is moving and shifting, the only way to counteract chaos is stillness. When things feel extraordinary, strive for ordinary. When the surface is wavy, dive deeper for quieter waters." --Kristin Armstrong