YOU SAID:

The flesh is weak but the will is strong.

INTO JAPANESE

肉は弱いですが、意志が強い。

BACK INTO ENGLISH

Flesh is weak but strong-willed.

INTO JAPANESE

肉は弱いが、意志が強いです。

BACK INTO ENGLISH

It is strong, but the flesh is weak.

INTO JAPANESE

それは強いが肉は弱いです。

BACK INTO ENGLISH

It is strong, but the flesh is weak.