YOU SAID:
The spirit is willing but the flesh is weak!
INTO JAPANESE
精神は意欲的ですが、肉体は弱いです!
BACK INTO ENGLISH
The spirit is willing, but the body is weak!
INTO JAPANESE
心は元気でも体は弱い!
BACK INTO ENGLISH
My heart is strong but my body is weak!
INTO JAPANESE
心は強いけど体は弱い!
BACK INTO ENGLISH
My mind is strong but my body is weak!
INTO JAPANESE
心は強いけど体は弱い!
BACK INTO ENGLISH
My mind is strong but my body is weak!
That didn't even make that much sense in English.