It is our true policy to steer clear of permanent alliances with any portion of the foreign world; so far, I mean, as we are now at liberty to do it; for let me not be understood as capable of patronizing [supporting] infidelity [disloyalty; unfaithfulness] to existing engagements. I hold the maxim [wise saying] no less applicable to public than to private affairs, that honesty is always the best policy. I repeat, therefore, let those engagements be observed in their genuine sense. But, in my opinion, it is unnecessary and would be unwise to extend them.

- Washington’s Farewell Address

Question
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What did Washington mean when he wrote that the maxim “honesty is the best policy” should be applied to foreign relations?

When Washington wrote that the maxim "honesty is the best policy" should be applied to foreign relations, he meant that it is important to be truthful and sincere in dealing with other countries. This implies that the United States should uphold its existing engagements and commitments with other nations in a genuine manner, without betraying their trust and loyalty. However, Washington also believed that it is unnecessary and unwise to form permanent alliances with foreign countries.