A person with positive mentality anticipates happiness, health and success, and believes that he or she can overcome any obstacle and difficulty. However, positive thinking is not a concept that everyone believes and follows. It is an exercise that you need to practice in order to stay calm and composed at the times of distress. If you learn to harness positivity and never allow any negative thoughts to control your state of being, only then Universe responds to that positivity within you and starts aligning things in your favour. That is the power of positivity.
Believe it or not there is science behind it. A verse from BHAGWADGEETA from Chapter VI, Verse 5 enlightens us on this subject.
Udhretatma Atmanam na ca atmanam avsaadyet
Atma ev hi atmnorbandh
u atmaev ripuratmana.
Meaning : Try to lift or raise yourself by your own Self. Never ever grieve, neglect, criticize, abuse yourself as you are your friend. But you become your greatest enemy when you curse or degrade yourself. So never underestimate your capacities and capabilities.
No one can lift you if you don’t want to be lifted, as a sleeping person can be awakened, but not a person who is pretending to be asleep. You are here in this planet by the grace of God with limitless power and energies in the latent form. Only you have to know that, realize that, and achieve that.
These words from the mouth of the Lord, form the base of the whole psychology and philosophy found in the modern world. There are so many people who reached impossible heights only because they believed in themselves.