the.com/faithfulness

the quiet superpower of staying when leaving would be easier and probably more entertaining.

means The quality of being loyal, steady, and true to a person, promise, belief, or commitment over time.

from From 'faith' plus the suffixes '-ful' (full of) and '-ness' (the state of being). 'Faith' itself came through Old French 'feid' from Latin 'fides,' meaning trust or belief — the same root that gives us 'fidelity' and 'confide.' So at heart, faithfulness is being 'full of trust-worthiness,' a state of brimming with the keepable kind of belief.

word origin
From Latin fides, meaning trust and confidence.
animal proof
Some albatrosses keep the same mate for decades.
brain chemistry
Vasopressin and oxytocin help wire long-term bonding.
ancient virtue
Romans worshipped Fides as a goddess of loyalty.
costly signal
It only counts when betrayal was genuinely possible.
for instance

penelope waiting for odysseus — greek mythology: waited 20 years for her husband's return from troy while fending off suitors

hachiko the dog — tokyo 1923-1935: waited at shibuya station every day for 9 years after owner's death

grace hopper usn — u.s. navy 1943-1986: 43 years of service, pioneered computer programming languages

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