功莫大焉

no greater contribution has been made than this (idiom)

meritorious deed or service / achievement / result / service / accomplishment / work (physics)

surname Mo

do not / there is none who

greatest / most important

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)

where / how