True inward quietness is not that which may be produced by shutting out all outward causes of distraction -- a process which, when carried out too severely, may intensify the inward ferment of the mind, especially in the young. It is rather a state of stable equilibrium; it is not vacancy, but stability -- the steadfastness of a single purpose.

Light Arising: Thoughts on the Central Radiance (ed. 1908)