It is however always ...

It is however always important to remember that the ability to see things in their correct perspective may be, and often is, divorced from the ability to reason correctly and vice versa. That is why a man may be a very good theorist and yet talk absolute nonsense.
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 Joseph A. Schumpeter

Quotes from the same author

Situations emerge in the process of creative destruction in which many firms may have to perish that nevertheless would be able to live on vigorously and usefully if they could weather a particular storm.
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 Joseph A. Schumpeter
To the believer Marxism presents, first, a system of ultimate ends that embody the meaning of life and are absolute standards by which to judge events and actions.
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 Joseph A. Schumpeter
In one important sense, Marxism is a religion. To the believer it presents, first, a system of ultimate ends that embody the meaning of life and are absolute standards by which to judge events and actions; and, secondly, a guide to those ends which implies a plan of salvation and the indication of the evil from which mankind, or a chosen section of mankind, is to be saved.
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 Joseph A. Schumpeter
Those revolutions are not strictly incessant; they occur in discrete rushes which are separated from each other by spans of comparative quiet. The process as a whole works incessantly however, in the sense that there always is either revolution or absorption of the results of revolution, both together forming what are known as business cycles.
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 Joseph A. Schumpeter
Access to the national dividend is usually to be had only on condition of some productive service previously rendered or of some product previously sold. This condition is, in this case, not yet fulfilled. It will be fulfilled only after the successful completion of the new combinations. Hence this credit will in the meantime affect the price level.
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 Joseph A. Schumpeter