Have you read this book, by miyamoto musashi?

"From one thing know ten thousand things ".

"

You should not have a favorite weapon -

To become over familiar with one weapon is as much a fault as not knowing it sufficiently well.

You should not copy others, but use weapons which you can handle properly.

It is bad for commanders and troops to have; likes, and dislikes.

These are things you must learn thoroughly.

".

Book of five rings.