Realizing that your self-talk is a key factor of the way you view any event or situation allows you to understand the power of your self-talk.
Your self-talk is the key factor that decides whether you will live a happy life or an unhappy life; whether you frequently experience positive things or negative things. Your self-talk is the key factor that changes encounters with kind, friendly, helpful people into encounters with cold, selfish, and uncaring people, or vice versa.
When someone really comprehends the power of self-talk, he understands on a deep level that his life experiences depend on how he views them. Your outlook is the key to the quality of your life. The difficulty involved with dealing with potentially challenging situations and people depends on your viewpoint and perspective. Your viewpoint, based on your self-talk, makes the situation harder to deal with, or easier.
When you have a "good eye" and see events and people in a positive light, you will have a totally different experience than someone who has a "bad eye." With a "bad eye," you see problems and hardships and difficulties everywhere. With a "good eye," people treat you better and life events will work in your favor. You see opportunities, where those with a "bad eye" see misfortune.
(from Rabbi Zelig Pliskin's book: "Conversations With Yourself", pp.35-6) [Artscroll.com])