err on the right side

act so that the least harmful of possible mistakes or errors is the most likely to occur

力求穩(wěn)妥

err on the side of

display more rather than less of (a specified quality) in one's actions

（行動上）多表現(xiàn)（某種品質(zhì)）

it is better to err on the side of caution.

多一些謹慎總是好的。

to err is human, to forgive divine

(proverb)it is human nature to make mistakes oneself while finding it hard to forgive others

(諺)犯錯人皆難免，寬恕則屬超凡