When the sage finds that you are not what you seemed, he will feel the resentment natural to a man who, conscious of great abilities, discovers that he has been tricked by understandings meaner than his own, and perhaps the distrust which he can never afterwards wholly lay aside may stop the voice of counsel and close the hand of charity
 Samuel Johnson, The History of Rasselas, Prince of Abissinia (1759). copy citation

Context

“I have always considered it as treason against the great republic of human nature to make any man’s virtues the means of deceiving him, whether on great or little occasions. All imposture weakens confidence and chills benevolence. When the sage finds that you are not what you seemed, he will feel the resentment natural to a man who, conscious of great abilities, discovers that he has been tricked by understandings meaner than his own, and perhaps the distrust which he can never afterwards wholly lay aside may stop the voice of counsel and close the hand of charity; and where will you find the power of restoring his benefactions to mankind, or his peace to himself?” To this no reply was attempted, and Imlac began to hope that their curiosity would subside; but next day Pekuah told him she had now found an honest pretence for a visit to the astronomer, for she would solicit permission to continue under him the studies in which she had been initiated by the Arab, and the Princess might go with her, either as a fellow-student, or because a woman could not decently come alone.” source