“Always the soul says to us all, Cherish your best hopes as a faith, and abide by them in action. Such shall be the effectual fervent means to their fulfilment.”
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".
Woman in the Nineteenth Century (1845)
Context: I stand in the sunny noon of life. Objects no longer glitter in the dews of morning, neither are yet softened by the shadows of evening. Every spot is seen, every chasm revealed. Climbing the dusty hill, some fair effigies that once stood for symbols of human destiny have been broken; those I still have with me show defects in this broad light. Yet enough is left, even by experience, to point distinctly to the glories of that destiny; faint, but not to be mistaken streaks of the future day. I can say with the bard,
"Though many have suffered shipwreck, still beat noble hearts."
Always the soul says to us all, Cherish your best hopes as a faith, and abide by them in action. Such shall be the effectual fervent means to their fulfilment.
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Margaret Fuller 116
American feminist, poet, author, and activist 1810–1850Related quotes

“The faith that I love the best, says God, is hope.”
Opening line.
The Portal of the Mystery of Hope (1912)

Talmud Bavli,Berakhot https://www.sefaria.org.il/Berakhot.61b.9?lang=bi&with=all&lang2=en|

"Into the Fire"
Song lyrics, The Rising (2002)

Describing a letter to Donald Trump following the 2016 US presidential election, quoted in [de Moraes, Lisa, James Clapper Reveals Contents Of Letter To Donald Trump About Which POTUS Nastily Tweeted, https://deadline.com/2017/08/james-clapper-donald-trump-beautiful-letter-cnn-tweet-1202155778/, 27 July 2018, Deadline Hollywood, August 24, 2017]

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 239.

Lilith, in Pt. V
1920s, Back to Methuselah (1921)
Context: I say, let them dread, of all things, stagnation; for from the moment I, Lilith, lose hope and faith in them, they are doomed. In that hope and faith I have let them live for a moment; and in that moment I have spared them many times. But mightier creatures than they have killed hope and faith, and perished from the earth; and I may not spare them for ever. I am Lilith: I brought life into the whirlpool of force, and compelled my enemy, Matter, to obey a living soul. But in enslaving Life's enemy I made him Life's master; for that is the end of all slavery; and now I shall see the slave set free and the enemy reconciled, the whirlpool become all life and no matter. And because these infants that call themselves ancients are reaching out towards that, I will have patience with them still; though I know well that when they attain it they shall become one with me and supersede me, and Lilith will be only a legend and a lay that has lost its meaning. Of Life only is there no end; and though of its million starry mansions many are empty and many still unbuilt, and though its vast domain is as yet unbearably desert, my seed shall one day fill it and master its matter to its uttermost confines. And for what may be beyond, the eyesight of Lilith is too short. It is enough that there is a beyond.

“No easy hope or lies
Shall bring us to our goal,
But iron sacrifice
Of body, will, and soul.”
For All We Have and Are, Stanza 4.
Other works
Context: No easy hope or lies
Shall bring us to our goal,
But iron sacrifice
Of body, will, and soul.
There is but one task for all—
One life for each to give.
What stands if Freedom fall?
Who dies if England live?