The duologue between the two characters was intense and thought-provoking.

She was lost in thought and didn't notice the time passing.

Free thought is essential for intellectual growth.

It's a bit cold, though.

I don't expect him to understand my innermost thoughts but I wonder what I can do to get him to hold an interest.

He made a thoughtless comment that hurt her feelings.

She is a thoughtful person who always considers others' feelings.

I thought about what she said.