Ego, Stubbornness and Playing favorites are by far the biggest stumbling blocks of leaders in achieving greater progress.
Ego – blocks your ability to be open and honest in your assessment of your self and the situation you are in. It comes in the way of your ability to ‘Listen’ even to your own conscience.
Stubbornness – impacts your ability to be flexible and adaptable, to the point of even compromising on the larger vision or goals
Playing favorites – stops you from providing space to the deserving
Even the great Mahatma Gandhi and I think many more of the great leaders of our times were at some point afflicted with this problem. In the Epic Mahabharata, Dhrithrashtra suffered from the same.