Is Too Much of Something Bad??

I belive that too much of anything is bad. I heard it said the other day "that a little fear is a good thing". I agree with that, fear can be a very powerful emotion if it is kept in control. A person who is afraid will have more power and will react to a situation quicker, but you have to learn to control your fears and not let it turn into panic. While a little fear is good, a little panic can be devastating because once panic sets in you began to lose reason and good judgment. You will still have a boost of strength, but you will not be able to control yourself and will spin further and further out of control.
The same can be said about anger. A little anger when you know how to control it is a very powerful ally, but just like fear if you can not control it, it turns into rage and then all is lost for you will do nothing but be on the attack, with no regards to any reason.
Next is love, can too much love be a bad thing. It's possible, if someone begins to let the love they have for someone or something turn into obsession, and just like with fear and anger once love changes into obsession you began to lose control and reason.
Then there is Power, and we all know that too much power is bad. And that brings to mind the saying that "Knowledge is Power", so is too much knowledge a bad thing?????