Obama seemed poised to realign American politics after his stunning 2008 victory. But the economy remains worse than even the administration's worst-case scenarios and the long legislative battles over health care reform financial services reform and the national debt and deficit have taken their toll. Obama no longer looks invincible.

Your success and happiness lies in you. Resolve to keep happy and your joy and you shall form an invincible host against difficulties.

An invincible determination can accomplish almost anything and in this lies the great distinction between great men and little men.

I am not a great theologian. I know there is a theological concept called invincible ignorance in which a strong enough faith binds you to any facts to the contrary.

My dad is such a good man. You know how when you are a child you think your dad is invincible? Well I still think that - he is so wise and everything I do I ask my dad's advice about first.

But I think it's more that when you're young you're invincible you're immortal - or at least you think you are. The possibilities are limitless you're inventing the future. Then you get older and suddenly you have a history. It's fixed. You can't change anything. I find that a bit disturbing to be honest.

There are no contests in the Art of Peace. A true warrior is invincible because he or she contests with nothing. Defeat means to defeat the mind of contention that we harbor within.