The most important things cannot be measured.
We know what we told him, but we don't know what he heard.
Two basic rules of life are: 1) Change is inevitable. 2) Everybody resists change.
The most important figures for management of any organization are unknown and unknowable.
Just because you can measure everything doesn't mean that you should.
The only useful function of a statistician is to make predictions, and thus to provide a basis for action.