(there's) no saying
There is no way one can be sure; no one knows or can tell. He's already very volatile at the moment—no saying how he'll react to bad news like this. Unfortunately, there's no saying if such an effort will actually translate to a meaningful, long-lasting improvement in the economy.
there is no saying
it is impossible to know.there’s no ˈknowing/ˈsaying/ˈtelling...
it is impossible to know/say/tell: There is no telling what he may do when he gets angry.There’s no saying what will happen.