Six at the beginning means:

One sits oppressed under a bare tree
And strays into a gloomy valley.
For three years one sees nothing.

When adversity befalls a man, it is important above all things for him to be strong and to overcome the trouble inwardly. If he is weak, the trouble overwhelms him. Instead of proceeding on his way, he remains sitting under a bare tree and falls ever more deeply into gloom and melancholy. This makes the situation only more and more hopeless. Such an attitude comes from an inner delusion that he must by all means overcome.