We receive His peace when we ask Him for it. We keep His peace by extending it to others. Those are the keys and there are no others.

Dear God, Please send to me the spirit of Your peace. Then send, dear Lord, the spirit of peace from me to all the world. Amen.

Fill you mind with the meaningless stimuli of a world preoccupied with meaningless things, and it will not be easy to feel peace in your heart.