A Book of Five Rings

In strategy it is important to see distant things as if they were close and to take a distanced view of close things.

Any man who wants to master the essence of my strategy must research diligently, training morning and evening. Thus can he polish his skill, become free from self, and realise extraordinary ability. He will come to possess miraculous power.

Whenever we have become preoccupied with small details, we must suddenly change into a large spirit, interchanging large with small.

trifles.
Do nothing which is of no use.

Distinguish between gain and loss in worldly matters.
Develop intuitive judgement and understanding for everything.
Perceive those things which cannot be seen.
Pay attention even to trifles.

Do not think dishonestly.
The Way is in training.
Become acquainted with every art.
Know the Ways of all professions.

In strategy it is necessary to treat training as a part of normal life with your spirit unchanging

The principle of strategy is having one thing, to know ten thousand things

Know the smallest things and the biggest things, the shallowest things and the deepest things.

It is often said that the study of strategy might not be effective in actual combat, but the true Way of strategy is to always practise usefully and teach usefully