Self-doubt does more to sabotage individual potential than all external limitations put together.

The quality of your thinking is largely determined by the quantity of the information you have with which to work

Your persistence is your belief in yourself.

Persistence is self-discipline in action.

Imagine your ideal future. Visualize yourself as if your life were perfect in every respect.

Above all, you must maintain a positive mental attitude, looking for the good in every situation, and remain determined to be a completely positive person.

Your ability to select your most important task at each moment, and then to get started on that task and to get it done both quickly and well, will probably have more of an impact on your success than any other quality or skill you can develop.