The Japanese martial art Karate-Do has five principles on conduct that should be pursued by its practitioners. In all books it comes with the koto at its end, just after the principal verb. I've read that koto means thing, and in other source I've read that koto after a verb makes it transform to a noun verb, but I think I've don't really understood that very well, since I can't understand the use of koto in this five phrases:

一、人格 完成に 努める こと
hitotsu, jinkaku kansei ni tsutomeru koto
Exert yourself in the perfection of character

hitotsu, makoto no michi wo mamoru koto
Be faithful and sincere

hitotsu, doryoku no seishin wo yashinau koto
Cultivate the spirit of perseverance

hitotsu, reigi wo omonzuru koto
Respect propriety

hitotsu, kekki no yū wo imashimuru koto
Refrain from impetuous and violent behaviour

These were extract from this site: http://www.shotokankaratedoassociation.com/translating-dojo-kun-meaning-behind-japanese-characters/ where they explain the philosophical meaning of the principles.

But, from the grammatical point-of-view, I didn't understood it. What is the meaning and the utility of this koto?

Thanks in advance!



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