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

Your persistence is, in fact, the true measure of your belief in yourself and your ability to succeed. Each time that you persist in the face of adversity and disappointment, you build the habit of persistence.

Just as your car runs more smoothly and requires less energy to go faster and farther when the wheels are in perfect alignment, you perform better when your thoughts, feelings, emotions, goals, and values are in balance.

You are a potential genius; there is no problem you cannot solve, and no answer you cannot find somewhere.

Time management requires self-discipline, self-mastery and self-control more than anything else.

The Unsuccessful Salesperson says, the other guy has the best territory. The Successful Salesperson says, every territory is the best one. The Unsuccessful Salesperson says, that company will never buy. The Successful Salesperson says, I can make that company buy.

Almost all stress, tension, anxiety, and frustration, both in life and in work, comes from doing one thing while you believe and value something completely different.