Do not collect weapons or practice with weapons beyond what is useful. - Miyamoto Musashi

From one thing, know ten thousand things.

In battles, when the armies are in confrontation, attack the enemy's strong points and, when you see that they are beaten back, quickly separate and attack yet another strong point on the periphery of his force. The spirit of this is like a winding mountain path. This is an important fighting method for one man against many. Strike down the enemies in one quarter, or drive them back, then grasp the timing and attack further strong points to right and left, as if on a winding mountain path, weighing up the enemies' disposition. When you know the enemies' level, attack strongly with no trace of retreating spirit.

Aspire to be like Mt. Fuji, with such a broad and solid foundation that the strongest earthquake cannot move you, and so tall that the greatest enterprises of common men seem insignificant from your lofty perspective. With your mind as high as Mt Fuji you can see all things clearly. And you can see all the forces that shape events; not just the things happening near to you.