Americans rightly think their patriotism is a sort of religion strengthened by practical service.

Alexis de Tocqueville (1805–1859) French writer, diplomat, politician

Democracy in America, Vol. 1, “Public Spirit of the Townships of New England” (1835)
    (Source)

Other translations: "For in the United States it is believed, and with truth, that patriotism is a kind of devotion which is strengthened by ritual observance." [tr. Reeve (1839)]