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
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.
Officials are not perpetually noble, and commoners are not perpetually base.
Related Quotes
It is not living that matters, but living rightly.
-- Socrates
No one desires evil.
-- Socrates
Ethics is the ground of being of human community — the way of aidagara (betweenness) between person and person.
-- Tetsuro Watsuji
Do not impose on others what you yourself do not desire.
-- Confucius
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
Blessedness is not the reward of virtue but virtue itself.
-- Benedictus de Spinoza