It is incumbent on us ...

It is incumbent on us diligently to remember that the kingdom of heaven was promised to the poor in spirit, and that minds afflicted by calamity and the contempt of mankind cheerfully listen to the divine promise of future happiness; while, on the contrary, the fortunate are satisfied with the possession of this world; and the wise abuse in doubt and dispute their vain superiority of reason and knowledge.
It is incumbent on us diligently to remember that the kingdom of heaven was promised to the poor in spirit, and that minds afflicted by calamity and the contempt of mankind cheerfully listen to the divine promise of future happiness; while, on the contrary, the fortunate are satisfied with the possession of this world; and the wise abuse in doubt and dispute their vain superiority of reason and knowledge.
 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