The meanings of the sentences are neither similar nor contradictory as they convey the importance of hard work and actions over mere existence.
Elbow-grease is the best polish. The work proves the worker. The meanings of the sentences are neither similar nor contradictory. The first sentence refers to hard work (elbow-grease) being the best way to achieve success. The second sentence implies that actions (the work) speak louder than words (the worker).
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