it's one thing to do A, it's another to do B

it’s ˌone thing to do ˈA, it’s (quite) aˌnother (thing) to do ˈB

,

A is ˈone thing, B is (quite) aˈnother

used for saying that you find the first thing acceptable or possible but the second thing definitely unacceptable or impossible: It’s one thing to write a short article; it’s quite another to write a whole book on the subject.Romance is one thing, marriage is quite another.
See also: another, one, thing
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