己所不欲，勿施于人。

　　doing is better than saying.

　　与其挂在嘴上，不如落实在行动上。

　　do it now.

　　机不可失，时不再来。

　　do nothing by halves.

　　凡事不可半途而废。

　　don‘t claim to know what you don‘t know.

　　不要不懂装懂。

　　don‘t have too many irons in the fire.

　　不要揽事过多。

　　1.他不是不愿意帮助你，而是他心有余而力不足。

　　It‘s not that he does not like to help, but that the spirit is willing, but the flesh is week.

　　2.心有余而力不足，形容有意 [干某事] 而客观上（如身体）不允许。

　　The spirit is willing, but the flesh is week describes a person has interest [to do something] but objectively, such as the body) it is not allowed.

　　3. 我也想去跑马拉松，可心有余而力不足啊。

　　I also want to run a marathon, however “the spirit is willing, but the flesh is week.”

　　4. 你们碰到这么大的困难，我也想帮助你，但是我心有余而力不足啊。

　　You run into such a big difficulty, I also want to help you, however “the spirit is willing, but the flesh is week”.

　　5.心有余而力不足

　　The spirit is willing, but the flesh is week.