Gratitude is the act of recognizing a person by someone who has rendered a benefit, aid, etc a favor.

Gratitude is an emotion that involves an emotional sense of debt towards another person, often accompanied by a desire to thank you, or to reciprocate a favor done for you.

In a religious context, gratitude can also refer to a sense of debt towards a deity, eg the expression of gratitude to God is a central theme of Christianity.

Psychological research has shown that individuals are more likely to experience gratitude when they receive a favor that is perceived to be (a) estimated by the container valuable to the benefactor, given by the benefactor with benevolent intentions, and given free (eg,. Bar-Tal, Bar-Zohar, Greenberg, & Hermon, 1977; Graham, 1988; Alameda & Anderson, 1976; Tesser, Gatewood, & Driver, 1968).

Research also suggests that feelings of gratitude may be beneficial to subjective emotional well-being (Emmons & McCullough, 2003). In people who are thanked in general, life events have little influence on experienced gratitude (McCullough, Tsang & Emmons, 2004).

Source: http://pt.wikipedia.org/wiki/Gratid%C3%A3o

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