“An epidemic of destruction sweeps the world today. The mind of civilized man is set to stop it. What the enemy would destroy, however, he must first see. To confuse and paralyze this vision is the role of camouflage. Here the artist and more particularly the modern artist can fulfill a vital function for opposed to this vision of destruction is the vision of creation. Historically, it has been the artist's role to make manifest the beautiful inherent in all the objects of nature and man. In the study of the object, as a thing seen, he has acquired a profound understanding and sensibility concerning its visual aspects..”

John F. Kennedy, address at the dedication of the Robert Frost Library, Amherst College, Amherst, Massachusetts (1963-10-26).
Misattributed

The Principles of Success in Literature (1865)
Context: An artist produces an effect in virtue of the distinctness with which he sees the objects he represents, seeing them not vaguely as in vanishing apparitions, but steadily, and in their most characteristic relations. To this Vision he adds artistic skill with which to make us see. He may have clear conceptions, yet fail to make them clear to us: in this case he has imagination, but is not an artist. Without clear Vision no skill can avail. Imperfect Vision necessitates imperfect representation; words take the place of ideas.

Vague Thoughts On Art (1911)

1963, Speech at Amherst College

The Principles of Success in Literature (1865)
Context: I wish to call special attention to the psychological fact, that fairies and demons, remote as they are from experience, are not created by a more vigorous effort of imagination than milk maids and poachers. The intensity of vision in the artist and of vividness in his creations are the sole tests of his imaginative power.

Quote from Leger's lecture "The aesthetics of the machine", in Paris, June 1924; as quoted by Paul Westheim in Confessions of Artists. - Letters, Memoirs and Observations of Contemporary Artists; Propyläen Publishing House, Berlin, 1925, p. 324; cited in Review by Francesco Mazzaferro http://letteraturaartistica.blogspot.nl/2016/03/paul-westheim1717.html
Quotes of Fernand Leger, 1920's

Remarks at Amherst College (26 October 1963)
1963

Don Soderquist “ The Wal-Mart Way: The Inside Story of the Success of the World's Largest Company https://books.google.com/books?id=mIxwVLXdyjQC&lpg=PR9&dq=Don%20Soderquist&pg=PR9#v=onepage&q=Don%20Soderquist&f=false, Thomas Nelson, April 2005, p. 21-22.
On Having a Personal Mission and Vision

1963, Speech at Amherst College
Context: If art is to nourish the roots of our culture, society must set the artist free to follow his vision wherever it takes him. We must never forget that art is not a form of propaganda; it is a form of truth.
Context: If art is to nourish the roots of our culture, society must set the artist free to follow his vision wherever it takes him. We must never forget that art is not a form of propaganda; it is a form of truth. And as Mr. MacLeish once remarked of poets, there is nothing worse for our trade than to be in style. In free society art is not a weapon and it does not belong to the spheres of polemic and ideology. Artists are not engineers of the soul. It may be different elsewhere. But democratic society — in it, the highest duty of the writer, the composer, the artist is to remain true to himself and to let the chips fall where they may. In serving his vision of the truth, the artist best serves his nation. And the nation which disdains the mission of art invites the fate of Robert Frost's hired man, the fate of having "nothing to look backward to with pride, and nothing to look forward to with hope."