According to the theory of LOA (Law of attraction) what is mastering one's mind tends to incarnate into reality, negative thoughts will attract negative events, positive thoughts will attract positive events as well. This is what causes the rich get richer, the poor get poorer.
The rich always think about wealth and abundance, while the poor always think about difficulties, poverty and poverty. All that is thought out will attract the same thing as what is thought. The ugliness attracts badness and goodness attracts good too.
Not easy to control the mind to always radiate positive waves. It is said that the mind is always moving and changing as much as 60,000 times a day-a night. The mind is never silent, it always moves change all the time, even when we sleep the mind keeps working, it never stops.
How can we control it to keep thinking on the positive? We can only know that our minds are emitting positive or negative waves of our feelings.
When we are feeling disappointed, annoyed, sad, anxious, depressed it's time for the thought to emit negative waves which will certainly present negative events also in our lives.
When we feel comfortable, happy, peaceful, prosperous, abundant life is the time when our minds radiate positive waves that will certainly bring positive events also in our lives.