He likes talking about himself and often talks about his experiences and thoughts.

He set out on a journey of soul-searching.

Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

When I hear that song, old memories come to mind.

This was truly an unexpected result.

I am surprised by this unexpected event.

His thoughts were as we expected.

He starts talking about himself at every opportunity, causing trouble for the people around him.

He is the type of person who thinks it's a moonlit night if it's bright, so he only has a one-sided perspective.