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In the best, the friendliest and simplest relations flattery or praise is necessary, just as grease is necessary to keep wheels turning.

Leo Tolstoy (2011). “War and Peace: Translated by Richard Pevear and Larissa Volokhonsky”, p.29, Vintage
In the best, the friendliest and simplest relations flattery or praise is necessary, just as grease is necessary to keep wheels turning.