Prior to Wordsworth, humor was an essential part of poetry. I mean, they don't call them Shakespeare comedies for nothing.

A coherent typeface is an essential part of a coherent branding strategy.

But, strictly speaking, this mythology was no essential part of ancient religion, for it had no sacred sanction and no binding force on the worshippers.

Irreverence is an essential part of our culture.

Networking is an essential part of building wealth.

The most essential part of my day is a proper dinner.