Cynicism is an attitude or state of mind characterized by a general distrust of others' motives believing that humans are selfish by nature, ruled by emotion, and heavily influenced by the same primitive instincts that helped humans survive in the wild before agriculture and civilization became established. A cynic may have a general lack of faith or hope in the human species or people motivated by ambition, desire, greed, gratification, materialism, goals, and opinions that a cynic perceives as vain, unobtainable, or ultimately meaningless and therefore deserving of ridicule or admonishment. It is a form of jaded prudence, and other times, realistic criticism or skepticism. The term originally derives from the ancient Greek philosophers, the Cynics, who rejected all conventions, whether of religion, manners, housing, dress, or decency, instead advocating the pursuit of virtue in accordance with a simple and idealistic way of life.By the 19th century, emphasis on the ascetic ideals and the critique of current civilization based on how it might fall short of an ideal civilization or negativistic aspects of Cynic philosophy led the modern understanding of cynicism to mean a disposition of disbelief in the sincerity or goodness of human motives and actions.[citation needed] Modern cynicism is a distrust toward professed ethical and social values, especially when there are high expectations concerning society, institutions, and authorities that are unfulfilled. It can manifest itself as a result of frustration, disillusionment, and distrust perceived as owing to organizations, authorities, and other aspects of society.