Cóngxiǎo jiù yào jiàoyù háizi wù yǐ è xiǎo ér wéi zhī.
From an early age children should be taught not to do wrong, however small.
Tips
history
From the deathbed edict of Shu Han founder Liu Bei (刘备) to his son Liu Shan, recorded in 《三国志·蜀书·先主传》裴松之注: 勿以恶小而为之,勿以善小而不为 — 'Do no evil, however small; miss no good, however small.' A textbook Confucian statement on moral consistency.
usage
Almost always paired with 勿以善小而不为. Standard quotation in civic-education and anti-corruption campaigns.