Though "the Bard" is often reference to William Shakespeare, Fuller here probably uses the term in a generic sense, and in tribute to the poet-philosopher she considered in some ways her mentor, Ralph Waldo Emerson, who may have made such a statement, which she elsewhere quotes as "I have witnessed many a shipwreck, yet still beat noble hearts".
More quotes by Margaret Fuller
I now know all the people worth knowing in America, and I find no intellect comparable to my own.
I am absurdly fearful, and various omens have combined to give me a dark feeling.
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Be not afraid of life. Believe that life is worth living, and your belief will help create the fact.
Attribution
Quote text and notes from Wikiquote: Margaret Fuller (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.