Care for one another impartially; benefit one another in mutual exchange.
兼相愛、交相利。

Philosophers
Mozi
Founder of Mohism in Warring States China (c. 470-390 BCE). Impartial care (jian ai) and non-aggression (fei gong) made Mohism the chief rival of Confucianism. Mohists also pioneered Chinese logic and engineering.
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Mozi's Other Quotes
Officials are not perpetually noble, and commoners are not perpetually base.
To do what is right is not to avoid blame and seek praise.
If killing one man is unrighteous and a capital offence, then by the same logic killing ten is tenfold unrighteous and ten capital offences; killing a hundred is a hundredfold unrighteous and a hundred capital offences.
Related Quotes
It is not living that matters, but living rightly.
-- Socrates
No one desires evil.
-- Socrates
Do not impose on others what you yourself do not desire.
-- Confucius
Ethics is the ground of being of human community — the way of aidagara (betweenness) between person and person.
-- Tetsuro Watsuji
Compassion is the foundation of morality.
-- Arthur Schopenhauer
A person may cause evil to others not only by his actions but by his inaction, and in either case he is justly accountable to them for the injury.
-- John Stuart Mill