(something) is one thing, (something else) is (quite) another

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(something) is one thing, (something else) is (quite) another

While it may be acceptable to do something, that does not make it acceptable to do something that is much more extreme or complicated than the first. Asking us to stay an extra hour each evening to finish a project is one thing, but demanding we work every weekend without overtime pay or else risk being fired is quite another. Expressing your affection for someone you've started dating is one thing; bombarding them with declarations of love after just a few days is another.
See also: another, one

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

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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
References in periodicals archive ?
So I wonder if he knew that it is one thing to risk hurting one's mother or father or Uncle John, and another to risk hurting one's children.
It is one thing to say that Sir Thomas More was a devout Catholic.
Theological humility is one thing. Theological intimidation is another.
It is one thing to watch feathers grow from chicken-skin grafts on nude mice, quite another to watch your mother undress herself in front of total strangers.
There is one thing that people need to hear, and that we need to say, and that is this, in the words of Bishop Fulton Sheen: "God does not love us because we are valuable.
I think it is one thing to gamble as a portfolio decision to do some as floaters, some fixed, take the risks on some floaters, do a hedge.
(It is one thing if someone doesn't remember something said five minutes ago; it is another thing when they do not remember the wall they just saw in front of them two seconds ago.) For a while, the caretaker can depend on the Alzheimer's patient's long-term memory -- their "automatic pilot" -- to keep a kind of sanity and safety in the house.
The system has gotten warped, and if there is one thing the white middle class can do from the outside, it is to actively back the reforms that will unwarp it.
It is one thing to acknowledge that a person is abusive and to say it is wrong and then to move on without dwelling on it.
It is one thing to read a book on the Jewish roots of Christianity; it is another thing entirely to hear phrases one knows by heart from the Christian tradition, and then to experience these very same words holding their original religious meaning in their original liturgical setting.