Not that we'll ever know all there is to know. Here's a statement worth memorizing. Training with confidence is the only way to train. Enthusiasm and determination will follow like boxcars on a freight train. Confidence, the absence of doubt, is a distillation of hope and faith and knowing.
Confidence is the pause between heartbeats.
Confidence by its nature is smart and hardworking. It shovels fuel into the furnace. It is not cocky, conceited or arrogant. It's not stubborn or filled with boast. These are characteristics of something quite the opposite.