Dhammapada Pãli

Dhammapadaya, Yamakavagga (The Pairs) Verse 5

Na hi verana verãni
sammant'idha kudãcanamm,
averena ca sammanti:
esa dhammo sanantano.

Meaning

Hatred is never appeased by hatred in this world; by non-hatred alone hatred is appeased. This is an eternal law.