An old timer once told me to make a mistake every now and then. If you do a perfect job every time, and then blow it, you get in trouble big time. If you screw up every now and then, and then blow, they go, "Ya, par for the course."
Yet, as my HS English teacher told me:
If you don’t aspire to correct grammar, you expire in the moors of mediocrity.
You are referring to what I call the ‘Random Error Generator’, built into every one of us.
I use it with regularity just to make sure I am still human.
The generator seems to rev up when alcohol is introduced into the system.
Also it gives glory to God Who alone is perfect.