This is an excellent quote that we can all relate to from our own personal life experiences. We can't achieve our goals if we don't have a positive frame of mind. Tools, training, and experience are all useless unless we have this. People who have a negative frame of mind are often unable to distinguish between the forest and the trees. It is they who will be the first to say that you can't do something because they have a limited understanding of the goal and are unwilling to learn.
When attempting to achieve a goal, it is important to maintain a positive frame of mind. There are not many important goals that are simple to achieve, but having a positive attitude will help you achieve them.
Blake Campbell