“Action preserves a sense of self-identity that reflection dispels. When we are at work in the world we have a seeming solidity. Action gives us consolation for our inexistence. It is not the idle dreamer who escapes from reality. It is practical men and women, who turn to a life of action as a refuge from insignificance.”

Ibid., p. 110
The Book of Disquiet
Original: A superioridade do sonhador consiste em que sonhar é muito mais prático que viver, e em que o sonhador extrai da vida um prazer muito mais vasto e muito mais variado do que o homem de acção. Em melhores e mais directas palavras, o sonhador é que é o homem de acção.

Source: Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970), Chapter 2

Education (1902)
Context: He who knows naught of dreaming can, likewise, never attain the heights of power and possibility in persuading the mind to act.
He who dreams not creates not.
For vapor must arise in the air before the rain can fall.
The greatest man of action is he who is the greatest, and a life-long, dreamer. For in him the dreamer is fortified against destruction by a far-seeing eye, a virile mind, a strong will, a robust courage.
And so has perished the kindly dreamer — on the cross or in the garret.
A democracy should not let its dreamers perish. They are its life, its guaranty against decay.
Thus would I expand the sympathies of youth.
Thus would I liberate and discipline all the constructive faculties of the mind and encourage true insight, true expression, real individuality.
Thus would I concentrate the powers of will.
Thus would I shape character.
Thus would I make good citizens.
And thus would I lay the foundations for a generation of real architects — real, because true, men, and dreamers in action.

Lennox Lewis (From his Twitter account)

Penguin Books 2015 edition, page 45.
No Place to Hide (2014)

Section 8 : Suffering and Consolation
Founding Address (1876), Life and Destiny (1913)
Context: The consolations of the moral ideal are vigorous. They do not encourage idle sentiment. They recommend to the sufferer action. Our loss, indeed, will always remain loss, and no preaching or teaching can ever make it otherwise. But the question is whether it shall weaken and embitter, or strengthen and purify us, and lead us to raise to the dead we mourn a monument in our lives that shall be better than any pillared chapel or storied marble tomb. The criterion of all right relations whatsoever is that we are helped by them. And so, too, the criterion of right relations to the dead is that we are helped, not weakened and disabled, by them.

Source: Cutting for Stone