The mind is a simmering cauldron, always burning. Now, tell me what coolness is.
The mind is a madman rushing about, stumbling, falling, getting up randomly, darting, hurtling. Now, tell me what calmness is.
These aren’t things that first come to the exterior and can later be extended to the interior. Coolness and calmness first appear inside, and then they take myriad expressions on the outside.
You can’t have roots sprouting from leaves. The roots are inside.