Do not criticize any other ...

Do not criticize any other martial arts or speak ill of others, as it will surely come back to you. The mountain does not laugh at the river because it is lowly, nor does the river speak ill of the mountain because it can not move.
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 Koichi Tohei

Quotes from the same author

You must practice to be able to return to essential principles at any moment.
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 Koichi Tohei
Countless people have attempted to define the absolute power of the world of nature. Some praise it as god, some call it the Buddha, others call it truth. Still others convert nature into a philosophy by which they attempt to sound its deepest truth. Such attempts to define the power of nature are no more than striving to escape its effects.
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 Koichi Tohei
There is no conflict in the absolute universe, but there is conflict in the relative world.
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 Koichi Tohei
When you coordinate your mind and body, you have unlimited access to the wisdom of the universe.
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 Koichi Tohei
Even if a hundred ton boulder should fall, I would be safe! When I say this, everyone laughs and wonders how. No need to try to stop it, just move out of the way. You do not have a problem if you do not try to take it on yourself. Most people suffer because they try to take upon themselves things which they do not need to.
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 Koichi Tohei