The development of effective and evidence-based psychological treatments is one of the major triumphs of the last decades. And based on this triumph, some folks say we don't really need to know why they work, we just need more of them. But that is jumping the gun on policy, and may just further embed the status quo into our management of mental health problems.
For some perfectionism is an internal wasteland where all positives are ignored and life is like wading through treacle. For others perfectionism makes the outside world never enough and disappointment poisons most activities and relationships. Perfectionists walk a tightrope where impending disaster is held at bay with extreme effort.
The cold weather that meant you had to change into a warmer coat, which then made you late. And who knows what this little delay in your schedule caused you to miss, maybe a bad bout of traffic, maybe an accident? Perhaps as the result of this you met a lady at the bus stop who you wouldn't usually see. Maybe she inspired you?
Granted, January is a pretty gloomy month (I was shocked to see a blue sky today, having forgotten what one looked like), but why is that particular day more depressing than any other? Well, of course, it's not. Blue Monday was actually invented by a psychologist to help promote some travel company.