Things in excess become their opposite

Tim Ferriss – The Four Hour Work Week:

It is possible to have too much of a good thing, in excess most endeavors and possessions take on the characteristics of their opposite. Thus, pacifists become militants, freedom fighters become tyrants, blessings become curses, help becomes hindrance, more becomes less. Too much, too many, and too often of what you want becomes what you don’t want. This is true of possessions and even time.