In Book II of "Rhetoric", Aristotle defines kindness as "helpfulness towards someone in need, not in return for anything, nor for the advantage of the helper himself, but for that of the person helped".Nietzsche considered kindness and love to be the "most curative herbs and agents in human intercourse". Kindness is considered to be one of the Knightly Virtues. In Meher Baba's teachings, God is synonymous with kindness: "God is so kind that it is impossible to imagine His unbounded kindness!"
In human mating choice, studies suggest that both men and women value kindness and intelligence in their prospective mates, along with physical appearance, attractiveness, social status, and age.
A "nice guy" is an informal and usually stereotypical term for an (often young) adult male who portrays himself as gentle, compassionate, sensitive, and/or vulnerable. The term is used both positively and negatively. When used positively, and particularly when used as a preference or description by someone else, it is intended to imply a male who puts the needs of others before his own, avoids confrontations, does favors, gives emotional support, tries to stay out of trouble, and generally acts nicely towards others. In the context of a relationship, it may also refer to traits of honesty, loyalty, romanticism, courtesy and respect. When used negatively, a nice guy implies a male who is unassertive, does not express his true feelings and, in the context of dating (in which the term is often used), uses acts of ostensible friendship with the unstated aim of progressing to a romantic or sexual relationship.
Based on experiments at Yale University using games with babies, some studies concluded that kindness is inherent to human beings. There are similar studies about the root of empathy in infancy - motor mirroring developing in the early months of life, to lead (optimally) to the easy concern shown by children for their peers in distress.
Barbara Taylor and Adam Phillips have stressed the element of necessary realism in adult kindness, as well as the way “real kindness changes people in the doing of it, often in unpredictable ways”.
Mark Twain from a compassion point of view considered "Kindness [as a] language which the deaf can hear and the blind can see."
It has been suggested that 'most of Shakespeare's opus could be considered a study of human kindness'.
Robert Louis Stevenson considered that 'the essence of love is kindness; and indeed it may best be defined as passionate kindness: kindness, so to speak, run mad and become importunate and violent'.
In October 2011, Life Vest Inside posted a video called "Kindness Boomerang".It shows how one act of kindness passes seamlessly from one person to the next and boomerangs back to the person who set it into motion. Orly Wahba, Life Vest Inside Founder and Director of Kindness Boomerang explains that each scene was based on real life experiences she personally went through; moments of kindness that left a lasting impression on her life. Within several months after its release, Kindness Boomerang went viral; reaching over 20 million people globally and eventually landing Wahba spot on the TED2013 stage to speak about the power of kindness.
^Aristotle (translated by Lee Honeycutt). "Kindness". Rhetoric, book 2, chapter 7. Archived from the original on December 13, 2004. Retrieved 2005-11-22.
^Nietzsche, Friedrich Wilhelm. "On the History of Moral Feelings," Human, all too human: a book for free spirits. Aphorism 48. [Original: Menschliches, Allzumenschiles, 1878.] Trans. Marion Faber with Stephen Lehman. University of Nebraska Press: First Printing, Bison Books, 1996.