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.

Reading this biscriptal kanji-kana text is difficult.

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

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

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

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

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

He proceeded with the conversation in a refined manner.