3 sentences

1. 读书足以冶人性情。

   dú​shū zú​yǐ yě rén xìng​qíng.

   Reading is enough to cultivate one's character.

   Source: Dong Chinese Dictionary

2. 他性情温和，从不轻易发脾气。

   tā xìng​qíng wēn​hé, cóng bù qīng​yì fā pí​qi.

   He has a mild temperament and never loses his temper easily.

   Source: Dong Chinese Dictionary

3. 他向来性情疏散，不愿在朝为官。

   tā xiàng​lái xìng​qíng shū​sǎn, bù yuàn zài​cháo wéi guān.

   He has always been of a carefree disposition and was unwilling to serve as an official at court.

   Source: Dong Chinese Dictionary