That public virtue which ...

That public virtue which among the ancients was denominated patriotism, is derived from a strong sense of our own interest in the preservation and prosperity of the free government of which we are members. Such a sentiment, which had rendered the legions of the republic almost invincible, could make but a very feeble impression on the mercenary servants of a despotic prince; and it became necessary to supply that defect by other motives, of a different, but not less forcible nature; honour and religion.
That public virtue which among the ancients was denominated patriotism, is derived from a strong sense of our own interest in the preservation and prosperity of the free government of which we are members. Such a sentiment, which had rendered the legions of the republic almost invincible, could make but a very feeble impression on the mercenary servants of a despotic prince; and it became necessary to supply that defect by other motives, of a different, but not less forcible nature; honour and religion.
 Edward Gibbon

Quotes from the same author

Our work is the presentation of our capabilities.
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 Edward Gibbon
The winds and waves are always on the side of the ablest navigators.
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 Edward Gibbon
To the University of Oxford I acknowledge no obligation; and she will as cheerfully renounce me for a son, as I am willing to disclaim her for a mother. I spent fourteen months at Magdalen College: they proved the fourteen months the most idle and unprofitable of my whole life.
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 Edward Gibbon
The chaste severity of the fathers in whatever related to the commerce of the two sexes flowed from the same principle -- their abhorrence of every enjoyment which might gratify the sensual and degrade the spiritual nature of man. It was their favourite opinion, that if Adam had preserved his obedience to the Creator, he would have lived for ever in a state of virgin purity, and that some harmless mode of vegetation might have peopled paradise with a race of innocent and immortal beings.
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 Edward Gibbon
The nations, and the sects, of the Roman world, admitted with equal credulity, and similar abhorrence, the reality of that infernal art [witchcraft], which was able to control the eternal order of the planets, and the voluntary operations of the human mind. . . . They believed, with the wildest inconsistency, that this preternatural dominion of the air, of earth, and of hell, was exercised, from the vilest motives of malice or gain, by some wrinkled hags and itinerant sorcerers, who passed their obscure lives in penury and contempt.
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 Edward Gibbon