3 sentences

1. 内在美比外在的容貌更重要。

   nèi​zài měi bǐ wài​zài de róng​mào gèng zhòng​yào.

   Inner beauty is more important than outward appearance.

   Source: Dong Chinese Dictionary

2. 虽然外在美很重要，但内在修养更关键。

   suī​rán wài​zài měi hěn zhòng​yào, dàn nèi​zài xiū​yǎng gèng guān​jiàn.

   While outward beauty is important, inner cultivation is more crucial.

   Source: Dong Chinese Dictionary

3. 每一件事物都有其内在的发展规律。

   měi yī jiàn shì​wù dōu yǒu qí nèi​zài de fā​zhǎn guī​lǜ.

   Every thing has its own inherent laws of development.

   Source: Dong Chinese Dictionary