I have found that each thought I have produces a consequence. If, for instance, I wake up in the morning and think, "today is going to be a good day", I usually end up having a good day, because I have set that tone within my mind. By setting a positive tone within my mind, I have positioned myself to react to the events throughout my day in a positive manner.
Say that I'm going about my day and someone at work makes a rude comment...if my mental tone is positive (ie. "today is going to be a good day"), it is likely that I would simply brush it off and forget about it. But if my mental tone is negative, it is likely that I would allow the comment to bother me and distract me from my work.
If my car breaks down on the drive to an important meeting, one option is to become extremely distraught and think, "I can't believe this! I hate this stupid car! What am I going to do?!" Another option is to remain calm and think, "Aww, man. Well, this sucks. But it's okay. I'll call those waiting for me and let them know. I don't know how I'm going to get this fixed, but I know I'll figure it out." What follows in the first scenario of thought process is most likely continued difficulty, struggle, and misfortune. What follows in the second is most likely a speedy recovery and immediate solutions to the problem.
Each thought plants a seed which will inevitably produce consequences. By choosing which seeds you plant and nourish, you become the creator of your destiny.
Does this idea resonate with you? I suggest reading, "As a Man Thinketh" by James Allen. The book begins as follows:
"Mind is the Master-power that molds and makes,
And Man is Mind, and evermore he takes
The tool of Thought, and, shaping what he wills
Brings forth a thousand joys, a thousand ills:--
He thinks in secret, and it comes to pass:
Environment is but his looking-glass."