“The essential quality of life is living' the essential quality of living is change; change is evolution; and we are part of it.”

What We Are Fighting For: A Radical Collective Manifesto (2012) https://www.plutobooks.com/9780745332857/what-we-are-fighting-for/

As quoted in How They Succeeded (1901) by Orison Swett Marden
Context: I do not think that there is any other quality so essential to success of any kind as the quality of perseverance. It overcomes almost everything, even nature.

First published in the "Roger Ebert's Journal" column (19 May 2010) http://www.rogerebert.com/rogers-journal/cannes-7-a-campaign-for-real-movies

22 September 1907
India's Rebirth
Context: It is the nature of human institutions to degenerate, to lose their vitality, and decay, and the first sign of decay is the loss of flexibility and oblivion of the essential spirit in which they were conceived. The spirit is permanent, the body changes; and a body which refuses to change must die. The spirit expresses itself in many ways while itself remaining essentially the same but the body must change to suit its changing environments if it wishes to live. There is no doubt that the institution of caste degenerated. It ceased to be determined by spiritual qualifications which, once essential, have now come to be subordinate and even immaterial and is determined by the purely material tests of occupation and birth. By this change it has set itself against the fundamental tendency of Hinduism which is to insist on the spiritual and subordinate the material and thus lost most of its meaning. The spirit of caste arrogance, exclusiveness and superiority came to dominate it instead of the spirit of duty, and the change weakened the nation and helped to reduce us to our present conditions.

Section 9 : Ethical Outlook
Founding Address (1876), Life and Destiny (1913)
Context: I believe in the supreme excellence of righteousness; I believe that the law of righteousness will triumph in the universe over all evil; I believe that in the attempt to fulfil the law of righteousness, however imperfect it must remain, are to be found the inspiration, the consolation, and the sanctification of human existence.
We live in order to finish an, as yet, unfinished universe, unfinished so far as the human, that is, the highest part of it, is concerned. We live in order to develop the superior qualities of man which are, as yet, for the most part latent.

Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 95

Selected Sonnets: A Bilingual Edition (2008), ed. William Baer, p. 70
Lyric poetry, Não pode tirar-me as esperanças, Mudam-se os tempos, mudam-se as vontades

Source: In Search of Excellence (1982), p. 75.