Moreover, slaves are like other people, and imbibe prejudices quite common to others. They think their own better than that of others.
 Frederick Douglass, Narrative of the Life of Frederick Douglass, an American Slave (1845). copy citation

Context

“I have been frequently asked, when a slave, if I had a kind master, and do not remember ever to have given a negative answer; nor did I, in pursuing this course, consider myself as uttering what was absolutely false; for I always measured the kindness of my master by the standard of kindness set up among slaveholders around us. Moreover, slaves are like other people, and imbibe prejudices quite common to others. They think their own better than that of others. Many, under the influence of this prejudice, think their own masters are better than the masters of other slaves; and this, too, in some cases, when the very reverse is true. Indeed, it is not uncommon for slaves even to fall out and quarrel among themselves about the relative goodness of their masters, each contending for the superior goodness of his own over that of the others.” source