( humorous , saying ) you intend to do good things but you are too lazy, weak or busy to actually do them
THE SPIRIT IS WILLING (BUT THE FLESH IS WEAK)
Meaning of THE SPIRIT IS WILLING (BUT THE FLESH IS WEAK) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005