Make definite assertions. Avoid tame, colorless, hesitating, non-committal language. Use the word not as a means of denial or in antithesis, never as a means of evasion.
~ William Strunk, Jr.

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To compare to is to point out or imply resemblances, between objects regarded as essentially of different order; to compare with is mainly to point out differences, between objects regarded as essentially of the same order.
~ William Strunk, Jr.

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