Quiz time

What do the following thinkers have in common?

(Highlight the space below the list with your cursor for the answer.)

* The Buddha
* Plato
* Plotinus
* Goethe
* Hegel
* Schelling
* Emerson
* Eckhardt Tolle

They all could be called "secular mystics"---they came to mystical conclusions based on logic and experience, not through any religious authority. This is notably true of Tolle, who, despite his Krishnamurtian approach, denies any religious association, and Plotinus. Others, especially Emerson, had a more inclusive approach, and were influenced by religious mystics both Christian and Hindu.
Write to me with any additions to my list.