2 sentences

1. 凡事都要适可而止，不要做得太过分。

   fán shì dōu yào shì​kě'ér​zhǐ, bù yào zuò de tài guò​fèn.

   Know when to stop and don't go too far.

   Source: Dong Chinese Dictionary

2. 父母不能一味地放纵孩子，要懂得适可而止。

   fù​mǔ bù néng yī​wèi de fàng​zòng hái​zi, yào dǒng​de shì​kě'ér​zhǐ.

   Parents should not blindly indulge their children; they must know where to stop.

   Source: Dong Chinese Dictionary