YOU SAID:
the body is weak but the spirit is willing
INTO JAPANESE
体は弱いですが、精神は喜んでいます
BACK INTO ENGLISH
I am weak but my spirit is happy
INTO JAPANESE
私は弱いですが、私の精神は幸せです
BACK INTO ENGLISH
I am weak but my spirit is happy
That didn't even make that much sense in English.