Fanaticism
To be fanatical about anything is dangerous. It can prevent one from seeing the truth. It is written in the Tao Te Ching that things should not go to extremes, for it is in the balance of the universe that allows harmony to prevail. Fanaticism can lead to closed eyes and a closed mind. Always strive to have an open mind. A mind like a parachute can only function properly when it is open.