Anxiety is the inactivity proceeding from disorder. Anxiety destroys ends, because when an person suffering from anxiety looks into the future he sees no attainable good. But whatever destroys an end must destroy action, for all actions are for some end. The modern psychiatric term for anxiety is “depression”.
Anxiety is, like all mental disorders, irrational. The one who suffers from it cannot “understand” it any more than the one who does not suffer from it. There is, in the last analysis, nothing to understand. Anxiety doesn’t “make sense” to anyone. If we don’t have it, we simply assume those who have it are weak and effeminate (and we are in a certain sense right). If we have anxiety, it is of no use to tell us that what we are doing is irrational- because our very problem is that we have embraced the irrational. It is of no use to tell the anxious person “to do something”- his very problem is that he has crippled his power to act.