小作怡情，大作伤身

a little bit of it does one good, but carried to excess it's harmful (idiom)

small / tiny / few / young

worker / workshop / (slang) troublesome / high-maintenance (person)

to do; to engage in / to write; to compose / to pretend; to feign / to regard as; to consider to be / to be; to act the part of / to feel (itchy, nauseous etc) / writings; works

harmony / pleased

feeling / emotion / passion / situation

see 大夫[dai4 fu5]

big; large; great / older (than another person) / eldest (as in 大姐[da4 jie3]) / greatly; freely; fully / (dialect) father / (dialect) uncle (father's brother)

your work (book, musical composition etc) (honorific) / to erupt / to begin abruptly

to injure / injury / wound

to be harmful to one's health

body / life / oneself / personally / one's morality and conduct / the main part of a structure or body / pregnant / classifier for sets of clothes: suit, twinset / Kangxi radical 158