Sentence:  As I am not drawing here on the <WSD>font</WSD> of imagination to refresh that of fact and experience, I do not suggest that the Tarot set the example of expressing Secret Doctrine in pictures and that it was followed by Hermetic writers; but it is noticeable that it is perhaps the earliest example of this art. 
Meaning of the word marked with <WSD> tags:  A source, wellspring, fount.