Happiness is a mass noun, you can't count it.

One part is important.

Each word and each phrase he said was deeply engraved in my heart.

He is good at writing school essays about his impressions of a book.

Reading this biscriptal kanji-kana text is difficult.

He interpreted his own haiku using the technique of writing and exegesis of one's own haiku.

The goods in this store are being sold for dirt cheap.

My four treasures of the study are a fountain pen, a pencil, an eraser, and a ruler.

He proceeded with the conversation in a refined and cultured manner.

He proceeded with the conversation in a refined manner.