1 He who comes is surely ill-intentioned, no-one well-meaning will come (idiom).
2 Be careful not to trust foreigners.
3 Beware of Greeks bearing gifts!
偃旗息鼓
yǎn qí xī gǔ
1 lit. lay down the flag and still the drums (idiom); fig. to cease
2 to give in
别树一旗
bié shù yī qí
1 lit. to fly one's banner on a solitary tree (idiom); fig. to act as a loner
2 to stand out
3 to develop one's own school
4 to have attitude of one's own
劝善惩恶
quàn shàn chéng è
1 to encourage virtue and punish evil (idiom); fig. poetic justice
2 you get what's coming to you
吴下阿蒙
Wú xià ā Méng
1 General Lü Meng 呂蒙|吕蒙 of the southern state of Wu (idiom); model of self-improvement by diligent study (from unlettered soldier to top strategist of Wu)
善始善终
shàn shǐ shàn zhōng
1 where there's a start, there's a finish (idiom); to finish once one starts sth
2 to carry things through
3 I started, so I'll finish.
善有善报
shàn yǒu shàn bào
1 virtue has its rewards (idiom); one good turn deserves another
善自为谋
shàn zì wéi móu
1 to be good at working for one's own profit (idiom)
善自珍摄
shàn zì zhēn shè
1 take good care of yourself! (idiom)
善解人意
shàn jiě rén yì
1 to be good at understanding others (idiom)
善财难舍
shàn cái nán shě
1 to cherish wealth and find it hard to give up (idiom); refusing to contribute to charity
2 skinflint
3 miserly
多愁善感
duō chóu shàn gǎn
1 melancholy and moody (idiom); depressed personality
多钱善贾
duō qián shàn gǔ
1 much capital, good business (idiom); fig. good trading conditions
宁左勿右
nìng zuǒ wù yòu
1 (of one's political views) to prefer left rather than right (idiom during the Cultural Revolution)
工欲善其事，必先利其器
gōng yù shàn qí shì , bì xiān lì qí qì
1 To do a good job, an artisan needs the best tools (idiom). Good tools are prerequisite to the successful execution of a job