If you were guaranteed to succeed at that one thing would you do it? Would you draw up a plan, set aside some time for it, talk about it, rejoice in the pursuit of it? Is there not a little part of you yearning with thirst of it? A bit of remorse absent it?
Look around you at all you have been able to accomplish in your life, big and small. Now stand in the middle of your life right now and do a slow motion twirl. Take it in. See what others see. What do you see? What do you feel? Take a full inventory. Anything missing? Is there an empty space you have claimed but have not manifest? Something you have wanted for so long you now have to make excuses to live without it?
Are you satisfied? Give your effort a grade. What grade was it? A passing grade?
One final question. Why are you playing out your one and only life so safe when you have a God that will not let you fail?