Philotimo is considered to be the highest of all Greek virtues, the standards for family and social living; the core concept is that of respect and walking in the right paths. In its simplest form, the term means "doing good", actions that show a man's behavior as being exemplary and taken with fortitude according to an ideal upbringing the philotimo way. Philotimo to a Greek is essentially a way of life.
Children are said to display philotimo when they display unconditional love and respect towards their parents, grandparents and friends, even through small actions such as expressions of gratitude for small gifts or random acts of kindness. It extends to include appreciation and admiration for heritage and ancestors. The concept was used to embody the assistance rendered to Allied soldiers on Crete after the Axis invasion of the island; locals felt driven by philotimo to hide Australians and Britons despite the death penalty for sheltering soldiers.
Filotimo or philotimo is a Greek noun comprised of the words philo (verb translated as “to like” or noun translating as “friend”) and timo (verb translating as “to honor”). It is hard to explain, impossible to translate in one word in any other language and so commonly used among Greeks that it is somehow believed that you are actually born with it and must stand up for it all your life. And just because filotimo represents a way of life for Greeks it includes ideas and virtues such as honor, justice, courage, dignity, pride, self sacrifice, respect, freedom, gratitude and hospitality.
The most untranslatable, demanding and really mysterious word in the Greek language is the word Filotimo. Literally, of course, it means friend of honor. But Filotimo is exceedingly much, much more.
I think it was the philosopher Thales who said, "Filotimo to the Greek is like breathing. A Greek is not a Greek without it. He might as well not be alive."
The closest to the meaning of the word that I found (in French) is here
Filotimo – Filotimo signifie littéralement un ami d’honneur, mais implique aussi de la dignité, de la fierté, du sacrifice et du respect. Le philosophe Thales disait: «Filotimo pour un grec, c’est comme respirer. Un grec n’est pas un Grec sans cela. Il pourrait tout aussi bien ne pas être en vie sans.”
but I am wondering if there are other French words or expressions that convey similar ideas.