Err on the right side act so that the least harmful of possible mistakes or errors is the most likely to occur.
err on the side of display more rather than less of (a specified quality) in one's actions.
to err is human (to forgive divine) Often used to make allowance for human error. This saying is recorded from the late 16th century, but in its quoted form, derives from Alexander Pope's Essay on Criticism (1711). The saying exists in Latin as humanum est errare, and a similar idea is found in a late Middle English proverb quoted in Chaucer's Tale of Melibee (c.1386), ‘for to do synne is mannyssh, but certes for to persevere longe in synne is werk of the devil.’