The great misfortune, the root of all the evil to come, was the loss of faith in the value of personal opinions. People imagined that it was out of date to follow their own moral sense, that they must all sing the same tune in chorus, and live by other people’s notions, the notions which were being crammed down everybody’s throat.

Boris Pasternak (1890-1960) Russian poet, novelist, and literary translator

Doctor Zhivago [До́ктор Жива́го], Part 2, ch. 13 “Opposite the House of Caryatids,” sec. 14 [Yury] (1955) [tr. Hayward & Harari (1958), UK ed.]
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Alternate translations:

The main misfortune, the root of all evil to come, was loss of the confidence in the value of one's own opinion. People imagined that it was out of date of follow their own moral sense, that they must all sing in chorus, and live by other people's notions, notions that were crammed down everybody's throat.
[tr. Hayward & Harari (1958), US ed.]

The main trouble, the root of the future evil, was loss of faith in the value of one’s own opinion. People imagined that the time when they followed the urgings of their moral sense was gone, that now they had to sing to the general tune and live by foreign notions imposed on everyone.
[tr. Pevear & Volokhonsky (2010)]