Source: The Root of the Righteous (1955), Chapter 13.
“Every mental act is composed of doubt and belief,
but it is belief that is the positive, it is belief
that sustains thought and holds the world together.”
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Sören Kierkegaard 309
Danish philosopher and theologian, founder of Existentialism 1813–1855Related quotes

The Ethics of Belief (1877), The Duty of Inquiry
Context: No man holding a strong belief on one side of a question, or even wishing to hold a belief on one side, can investigate it with such fairness and completeness as if he were really in doubt and unbiased; so that the existence of a belief not founded on fair inquiry unfits a man for the performance of this necessary duty.
Nor is it that truly a belief at all which has not some influence upon the actions of him who holds it. He who truly believes that which prompts him to an action has looked upon the action to lust after it, he has committed it already in his heart. If a belief is not realized immediately in open deeds, it is stored up for the guidance of the future. It goes to make a part of that aggregate of beliefs which is the link between sensation and action at every moment of all our lives, and which is so organized and compacted together that no part of it can be isolated from the rest, but every new addition modifies the structure of the whole. No real belief, however trifling and fragmentary it may seem, is ever truly insignificant; it prepares us to receive more of its like, confirms those which resembled it before, and weakens others; and so gradually it lays a stealthy train in our inmost thoughts, which may someday explode into overt action, and leave its stamp upon our character for ever.

“Previous to the time of Pascal, who would have thought of measuring doubt and belief?”
Who could have conceived that the investigation of petty games of chance would have led to the most sublime branch of mathematical science - the theory of probabilities?
Source: The Theory of Political Economy (1871), Chapter I, Introduction, p. 41.

A man must say what he believes clearly, without dogma, and without guile.
Statement during the 1968 election campaign, as quoted in party literature. "Pierre Elliott Trudeau for Canada", 1968 leaflet http://www.ebay.com/itm/Pierre-Elliott-Trudeau-for-Canada-1968-Leaflet-Bill-Vander-Zalm-Liberal-Party-BC/322004097304?_trksid=p2045573.c100033.m2042&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3D9020a37aa0b24dd68f1d3f5025b50b52%26pid%3D100033%26rk%3D2%26rkt%3D4%26sd%3D381542319016

Cardinal Winning Lecture (February 2, 2008)

Original: (it) Qualsiasi emozione influisce sui nostri pensieri, le nostre credenze e le nostre azioni. Le forti emozioni positive esercitano un grande potere sul corpo umano e sul mondo intero.
Source: prevale.net

“Beliefs are what divide people. Doubt unites them.”
2000 Years of Disbelief : Famous People with the Courage to Doubt (1996) by James A. Haught

Der Glaube an eine bestimmte Idee gibt dem Forscher den Rückhalt für seine Arbeit. Ohne diesen Glauben wäre er verloren in einem Meer von Zweifeln und halbgültigen Beweisen.
Attributed in Konrad Zuse http://www.dpma.de/ponline/erfindergalerie/bio_zuse.html on "Die Erfindergalerie", dpma.de, 2008
Sex, Ecology, Spirituality (1995, 2000)
Context: Global consciousness is not an objective belief that can be taught to anybody and everybody, but a subjective transformation in the interior structures that can hold belief in the first place, which itself is the product of a long line of inner consciousness development.