YOU SAID:

it is decreed that one shall pound the pillars

INTO JAPANESE

柱を叩くことは定められている

BACK INTO ENGLISH

It is decided to hit a pillar

INTO JAPANESE

柱にぶつかることにした

BACK INTO ENGLISH

I decided to bump into a pillar

INTO JAPANESE

私は柱にぶつかることにしました

BACK INTO ENGLISH

I decided to bump into a pillar