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
Every other is wholly other.
-- Jacques Derrida
Attention is the rarest and purest form of generosity.
-- Simone Weil
The purpose of human existence is to attain supreme happiness.
-- Farabi
If you see fraud and do not say fraud, you are a fraud.
-- Nassim Nicholas Taleb
Nothing in the world is worth turning away from what we love.
-- Albert Camus
Blessedness is not the reward of virtue but virtue itself.
-- Benedictus de Spinoza