He (Macaulay) has occasional flashes of silence that make his conversation perfectly delightful

Silence is also a form of speaking.

Silence is also conversation.

It was mortifying to find how strong the habit of idle speech may become in one’s self. One need not always be saying something in this noisy world.

Silence is one of the great arts of conversation.

The desert has its holiness of silence, the crowd its holiness of conversation.