Peace of mind, which comes from pure and holy motives and actions, will give free and vigorous spring to all the organs of the body. Inward peace and a conscience void of offense toward God will quicken and invigorate the intellect like dew distilled upon the tender plants…. The meditations are pleasing because they are sanctified. The serenity of mind which you may possess will bless all with whom you associate. This peace and calmness will, in time, become natural, and will reflect its precious rays upon all around you, to be again reflected upon you.
The more you taste this heavenly peace and quietude of mind, the more it will increase. It is an animated, living pleasure which does not throw all the moral energies into a stupor, but awakens them to increased activity. Perfect peace is an attitude of heaven which angels possess.
Lift Him Up, page 94