Quite simply:
"Do unto others as you would have them do unto you."

This is of course one of the many versions of the positive affirmation of the so called Golden Rule.
For more details, see ​https://en.wikipedia.org/wiki/Golden_Rule 

Basically, you should treat/approach everyone with: Understanding, Compassion, Helpfulness, Empathy, Trustworthiness, Kindness, Generosity, Reliably, Caring, Forgiving, Non-judgmentally, Supportively, Interest, Fairness, Honesty, Patience, Thoughtfulness, Tolerance and Respectfully.

The 4.5' 2017 Heineken Worlds Apart commercial nails it (See ​www.youtube.com/watch?v=dKggA9k8DKw). Let's go have a beer and chat!

Morgan Freeman to Jack Nicholson in The Bucket List (2007), a fair movie about two men dying of cancer living out their last days, while sitting on top of the Great Pyramid of Giza (1):

​You know, the ancient Egyptians had a beautiful belief about death. When their souls got to the entrance to heaven, the guards asked two questions. Their answers determined whether they were able to enter or not. ‘Have you found joy in your life?’ 'Has your life brought joy to others?'  

(1) I too climbed to the top the Great Pyramid of Giza (also called Cheops or Khufu and built between 2560-2540 BCE) in 1979 and watched the sunrise over Cairo, Egypt.

The Antikythera mechanism is an ancient analog computer designed to calculate astronomical positions. It was invented 1,500 years before any other known similar mechanism and the related  technology. 

http://www.math.sunysb.edu/~tony/whatsnew/column/antikytheraI-0400/kyth1.html
http://en.wikipedia.org/wiki/Antikythera_mechanism
http://www.wimp.com/coolfind/
http://www.antikythera-mechanism.com
http://www.guardian.co.uk/science/2012/jun/06/extraordinary-2000-year-old-computer
http://www.theregister.co.uk/2010/12/10/lego_computer/