Walk of Life

What is the meaning and origin of the idiom "from all walks of life"?  When people talk about walk(s) of life, they are referring to different types of jobs and different levels of society. "The club has members from all walks of life."

The phrase "people from all walks of life" is often used informally to convey that a group of people consists of individuals from diverse backgrounds and occupations. It can also bring to mind the idea that people from all socioeconomic classes and ways of living are represented

OED's earliest evidence for "walk of life" is from 1733, in the writing of Eustace Budgell.

But why is it a "walk" of life? I found no explanation. My guess would be that each life is a journey and walking is one, especially in the 1700s, way of moving through the day and your life.