too much of a good thing

too much of a good thing

An excessive, unhelpful, or harmful amount of something that is otherwise enjoyable or beneficial. You're going to hurt yourself if you keep exercising this much. You can have too much of a good thing, you know! The added security features on the new phone proved to be too much of a good thing, making it incredibly difficult for even the owner to access the device.
See also: good, much, of, thing

too much of a good thing

more of a thing than is good or useful. I usually take short vacations. I can't stand too much of a good thing. Too much of a good thing can make you sick, especially if the good thing is chocolate.
See also: good, much, of, thing

too much of a good thing

Too large an amount of a beneficial or useful thing or activity can be harmful or excessive. For example, The indoor decorations are fine but the outdoor Santa, sled, reindeer, gnomes-it's just too much of a good thing . Expressed in slightly different form even earlier, Shakespeare used this precise wording in praise of moderation in As You Like It (4:1): "Can one desire too much of a good thing?"
See also: good, much, of, thing