...The policy of the Confederacy isas fixed and immutable on this subject as the imperfection of humannature permits human resolve to be... 
W. E. B. Du Bois 「The Suppression of the African Slave Trade to the United States of America」
...There is nothing that requires more deliberation than the choice of a travelling companion; any serious imperfection of temper may make a journey very miserable...
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...The causes of variationseem to be the inequality and imperfection of things;the pressure of life is unequally distributed, andthis is one of Nature's ways that accounts for muchthat we see about us...
John Burroughs 「Ways of Nature」
...Thiserror has arisen among some learned men, partly through want of faith,and partly through weakness and imperfection of intellect...
Dr. D.M. Brooks 「The Necessity of Atheism」
..."* This is nevertheless the lion-head-shaped island, particularly mentioned by Tasman, as lying twelve miles out from the coast: the mistake arose from the imperfection of the accounts...
Matthew Flinders 「A Voyage to Terra Australis」
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