The optimism of the Left was created and maintained by a strong feeling: admiration for the power of reason, certainty that the application of science to industry would revolu­tionise the order of human society and the condition of its individual members. The ancestral aspiration towards human brotherhood was united with faith in practical science in order to inspire either nationalism or socialism or both. (Raymond Aron)

The optimism of the Left was created and maintained by a strong feeling: admiration for the power of reason, certainty that the application of science to industry would revolu­tionise the order of human society and the condition of its individual members. The ancestral aspiration towards human brotherhood was united with faith in practical science in order to inspire either nationalism or socialism or both.

Raymond Aron

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certainty condition faith human industry left nationalism order power reason science

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