http://www.merel.us/Joker/Cartoons/AnimalToons/images/I%20Think%20I%20Can_gif.jpg

assurance, backbone, boldness, bravery, certainty, certitude, constancy, conviction, courage, dauntlessness, decision, dedication, doggedness, dogmatism, drive, energy, fearlessness, firmness, fortitude, grit, guts, hardihood, heart, independence, indomitability, intrepidity, nerve, obstinacy, persistence, pluck, purpose, purposefulness, resoluteness, resolution, resolve, self-confidence, single-mindedness, spunk, steadfastness, stubbornness, tenacity, valor, willpower