My personal thought is that everyone should be treated equally.

He values his private life.

He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

He likes to learn new words.

He is good at speaking Spanish.

He can speak Japanese fluently.

He understands the meaning of the proverb 'Teaching is half learning', which means that teaching leads to one's own learning.