If your thinking is stinking so will your results. What you think about, you create. This is why all the monumental classic personal-achievement books have focused on how you think: Think and Grow Rich, As a Man Thinketh, The Power of Positive Thinking, The Magic of Thinking Big, etc.
You are not what you think you are, but what you think… you are!
The most constant influence of conditioning that affects our lives, our results and our ability to achieve is the information we feed our mind.
Computers are complex systems, but how they work is rather simple. What you input is what it outputs. It doesn’t judge or discriminate; it simply acts on the input. That is also how your mind works. It does not judge or discriminate the information you feed it; it simply acts on the input. I am sure you have heard the axiom “Garbage in, garbage out.” This is true for computer programming, and for the information you allow to program your mind.
This is why it is crucial that you are careful what you feed your mind.