When you try to cool down hot emotions, what tends to happen is that you end up either repressing them or losing them altogether. Neither is desirable. Without emotion, much social interaction loses its meaning or changes for the worse.
The modern believer is not suspicious enough, which is perhaps why, when they try to construct arguments in their defence, the convictions are left doing all the work and reason, debilitated by neglect, weakly fails to prop them up.
There are many things you shouldn't measure. Don't, for example, try to measure how much you love your wife!