This universe has definite laws. One of the most important to understand is the Law Of Attraction. It states that like attracts like. The easiest way to explain this is... when you start thinking about something, you attract more thoughts and vibrations within the same field, or vibrational escrow.
You have a thought about your dog, and within seconds, you have more thoughts about your dog. It's pretty simple.
Along my journey of learning this law, I had to let go of giving energy to unwanted circumstances. Instead of taking on a negative perspective at my old job, I would very much create my reality with affirmations. Driving in the car to work, I would recite and repeat positive affirmations "I attract love into my life", "people are happy around me", "I attract abundance at work", "work is easy and flowing for me". I was amazed at how this worked. I would go into work and all the members were so nice to me, would give generous tips, and most importantly, I felt good, and my reality was in line with what I wanted.
When we say "everything happens for a reason", it is literal. People like to believe that until they get in a car crash and then blame some god for wrong doing. Everything, everything, everything happens for a reason, and it's not a fairy tale kind of reason.
It's simply that the vibration that you are resonating on, attracts to you your reality.
A person financially poor attracts this upon themselves because of their beliefs about money and how much they deserve or feel worthy to have.
A millionaire has a completely different mindset. They don't feel the illusion of lacking money.
Brother Bentinho Massaro teaches that there is NO Lack, in an all inclusive universe. Meaning, everything just is, but is different in a sense. Instead of this person having less of something, they just have something different.
This is how gratitude shapes your reality to something wonderful. When you state things you are grateful for, or write them down, or imagine them... you are increasing the vibration in your body/mind. Your cells, your entire being, your organs, your muscles, your brain and thoughts, everything (continue in comments)