What is spirituality?

When I first read this quote today, I wanted to share it because I liked it:

[Spirituality is] what happens when we open ourselves to something greater than ourselves. Some find it in the beauty of nature, or art, or music. Others find it in prayer, or performing a mitzvah, or learning a sacred text. Yet others find it in helping other people or in friendship or love.
—Rabbi Jonathan Sacks

But opening yourself to something greater is the mechanism that every nefarious movement such as nationalism or a cult uses as well.

Definitions aren’t easy.