Abrahamic religion
Humanity is one of Thomas Aquinas' "Seven Heavenly Virtues."[7] Beyond that, humanity was so important in some positivist Christian cultures that it was to be capitalized like God.[8] Kindness, altruism and love are all mentioned in the bible. Proverbs 19:22 "states the desire of a man is his kindness." On the topic of altruism, emphasis is placed on helping strangers (Hebrews 13:1) and the biblical adage "it is better to give than to receive" (Acts 20:35).
 

To live humanity
Choose to love, love everyone as they would your brothers and sisters...
Always look for the good in people, focus on people's potentials...
Treat everyone as equals, forgive, show compassion...

KNIGHTLY VIRTUES - Chivalric virtues in medieval Europe
In the 8th century, upon the occasion of his coronation as Holy Roman Emperor, Charlemagne published a list of knightly virtues:

Love God
Love your neighbour
Give alms to the poor
Entertain strangers
Visit the sick
Be merciful to prisoners
Do ill to no man, nor consent unto such
Forgive as ye hope to be forgiven
Redeem the captive
Help the oppressed
Defend the cause of the widow and orphan
Render righteous judgement
Do not consent to any wrong
Persevere not in wrath
Shun excess in eating and drinking
Be humble and kind
Serve your liege lord faithfully
Do not steal
Do not perjure yourself, nor let others do so
Envy, hatred and violence separate men from the Kingdom of God
Defend the Church and promote her cause.

Love
Love has many different definitions ranging from a set of purely biological and chemical processes to a religious concept. As a character strength, love is a mutual feeling between two people characterized by attachment, comfort, and generally positive feelings. It can be broken down into 3 categories: love between a child and their parents, love for your friends, and romantic love.[9] Having love as a strength is not about the capacity to love, as such, it is about being involved in a loving relationship.

Love, in the psychological sense, is most often studied in terms of attachment to others. A degree of controversy surrounds defining and researching love in this way, as it takes away the “mystery of love.”[10] Because love is mysterious, to an extent, it is most often studied in terms of attachment theory, because it can be studied in the way across ages. In infants, attachment is studied through the Strange Situation Test. Attachment to an individual, usually the mother, is determined by how distressed the infant becomes when the mother is taken out of the experimental setting.[11] There are several models of adult attachment including the Adult Attachment Interviews, Adult Attachment Prototypes and more. Generally adult attachment models focus on the mental representation of the visible signs of attachment seen in infants.[12]

Evidence in support of the benefits of love are seen in the negative affect states that result from lacking love. Orphaned children have been targeted in studies about negative attributes resulting from lack of attachment. A study by Smyke and others found that children raised in an environment that didn’t allow children to become attached to their preferred caregivers experienced attachment disorders.[13] Additionally, individuals who develop securely attached have a lower likelihood of depression, high-self esteem, and less likelihood of divorce.[14]

Kindness
The strength kindness encompasses most related terms that evoke feelings of altruism, generosity, helpfulness and a general desire to help people. That is, a disposition for helping humanity. The following statements are from the Values in Action (VIA) psychological assessment, aimed at determining people's strengths in kindness: others are just as important to me, giving is more important than receiving, I care for the ungrateful as well as the grateful.[15] Kindness, as a part of humanity, is deeply rooted in philosophical and religious traditions, each having words for the altruistic love aspect of kindness, such as agape in Greek, chesed in Hebrew, and the Latin word philantropia, the root of the word "philanthropy."[15] Kindness is so valued as a strength beyond religious and theoretical concepts that it is advocated through school community service programs and national programs like AmeriCorps. Additionally, while gender differences in kindness are statistically significant, they are minimal, and the methods of testing used may not always have construct validity.[16]

Kindness is most often measured on a case by case measure and not usually as a trait. The Self-Report Altruism Scale and the Altruism Facet Scale for Agreeableness Measure of the Revised NEO Personality Inventory (NEO-PI-R) psychological assessment are often used to ask people how often they engage in altruistic behaviors and gauge their concern for others.[17] The former, however, only asks about 20 specific altruistic acts, leaving out a wide range of altruistic behaviors.

There are numerous benefits from kindness and altruism on both sides of the action. For some, the motivation to be kind comes from a place of egoistic motivation, and thus the benefit to them is the positive affect state they receive from the action.[18] Another study found that the process of being kind develops pro-social skills in children, which positively effects their attachments and relationships.[19] Additionally, volunteerism in the elderly has shown to lead to decreased risk of early death, and mental health benefits.[20] One thing to note is the difference between altruism as a trait and as an act.[20]

Social intelligence
Social intelligence is the most modern of the three strengths associated with humanity. The Character Strengths and Virtues (CSV) psychological assessment defines social intelligence as the ability to understand “relationships with other people, including the social relationships involved in intimacy and trust, persuasion, group membership, and political power.”[21]

Intelligence has many psychological definitions from Weschler’s intelligence to the various theories of multiple intelligence. The CSV divides intelligence into hot and cold, hot intelligence being those intelligences related to active emotional processes. (338) Individuals with high social intelligence are very self-aware, and effective organizers and leaders.[22] Additionally, it combines elements of the other two hot intelligences, personal and emotional intelligence. Personal intelligence being the internal counterpart to social intelligence and emotional intelligence being the capacity to understand emotions. The CSV highlights three social intelligence measurement scales: Factor Based Social Intelligence Tasks, Psychological Mindedness Assessment Procedure, and Mayer-Salovey-Caruso Emotional intelligence Test.[23]

Social Intelligence research is limited, however, there is much literature on the characteristics associated with social intelligence. Zaccaro et al. found social intelligence and perceptiveness to be integral to effective leadership; that is, good leaders are “social experts.”[24] Emotional intelligence, too, plays a role in leadership. Another study found that emotional intelligence enables leaders to better understand their followers, thereby enhancing their ability to influence them.[25]

Psychological research on humanity as a virtue
Virtue and wellbeing
Although only a relatively new field of inquiry for psychological researchers, character strengths[26][27] and virtues[28][29][30] have been consistently measured in psychometric surveys and have been shown to be positively associated with psychological and subjective wellbeing.[31] What is more, even among those who endorse a spiritual/theistic worldview, these salutary associations appear to be better explained by humanity/civility rather than endorsing a faith in a supernatural being.[

There are many sides to every story.
There are good and bad sides to every story.
We all have our good and bad sides too.