The purpose of the third paragraph of the passage can be

Answer this question based on the following passage.

            The debt American intellectual growth owes to the
            revolutionary exiles has never been fully appreciated. The
            seed disseminated by them, though so little understood at
            the time, has brought a rich harvest. They have at all times
(5)        held aloft the banner of liberty, thus impregnating the social
            vitality of the Nation. 
            Emma Goldman was one of the few who, while thoroughly
            preserving their individuality, became an important factor
            in the social and intellectual atmosphere of America. The
 (10)     life she led was rich in color, full of change and variety.  She
            rose to the topmost heights, and also tasted the bitter dregs
            of life. The sensational press surrounded her name with so
            much misrepresentation and slander, it would seem almost
            a miracle that, in spite of this web of calumny, the truth broke
(15)      through and a better appreciation of this much maligned
            idealist manifested itself.  The mist in which the name of
            Emma Goldman had so long been enveloped gradually
            dissipated.  Her energy in the furtherance of such an
            unpopular idea as Anarchism, her deep earnestness,
(20)      her courage and abilities, find growing understanding
            and admiration.
            There is but little consolation in the fact that almost every
            representative of a new idea has had to struggle and suffer
            under similar difficulties.  Is it of any avail that a former
(25)      president of a republic pays homage at Osawatomie to the
            memory of John Brown?  Or that the president of another
            republic participates in the unveiling of a statue in honor of
            Pierre Proudhon, and holds up his life to the French nation
            as a model worthy of enthusiastic emulation?  Of what avail
(30)      is all this when, at the same time, the LIVING John Browns
            and Proudhons are being crucified?  The honor and glory of
            a Mary Wollstonecraft or of a Louise Michel are not
            enhanced by the City Fathers of London or Paris naming a
            street after them - the living generation should be concerned
(35)      with doing justice to the LIVING Mary Wollstonecrafts and
            Louise Michels.  Posterity assigns to men like Wendel
            Phillips and Lloyd Garrison the proper niche of honor in
            the temple of human emancipation; but it is the duty of their
            contemporaries to bring them due recognition and appreciation
(40)      while they live.
            The path of the propagandist of social justice is strewn with
            thorns. The powers of darkness and injustice exert all their
            might lest a ray of sunshine enter his cheerless life. Nay,
            even his comrades in the struggle--indeed, too often his
(45)      most intimate friends--show but little understanding for
            the personality of the pioneer.  Envy, sometimes growing
            to hatred, vanity and jealousy, obstruct his way and fill his
            heart with sadness.  It requires an inflexible will and
            tremendous enthusiasm not to lose, under such conditions,
(50)      all faith in the Cause.  The representative of a revolutionizing
            idea stands between two fires: on the one hand, the
            persecution of the existing powers which hold him
            responsible for all acts resulting from social conditions;
            and, on the other, the lack of understanding on the part of
(55)      his own followers who often judge all his activity from a
            narrow standpoint. Thus it happens that the agitator stands
            quite alone in the midst of the multitude surrounding him.
            Even his most intimate friends rarely understand how
            solitary and deserted he feels.