Where
would I possibly find enough leather
With which to cover the surface of the earth?
But wearing leather just on the soles of my shoes
Is equivalent to covering the earth with it.
Likewise
it is not possible for me
To restrain the external course of things;
But should I restrain this mind of mine
What would be the need to restrain all else?
Shantideva, A Guide to the Bodhisattva's Way of Life
8th Century
Calming the Mind
Working with the Mind
Contemplation
Retreat
Meditation in Action
Shambhala Training by W.A. Gordon:
Shambhala The Path of the Warrior