This is one I resisted for a long time:
It is the most important factor in your success. Gratefulness for not only what you have, but what is to come, and everything that comes your way.
When you are in a state of gratefulness - there are so many disempowering emotions you simply can't hold at the same time: Worry, Disappointment, "I'll be happy when X happens" thinking, Pessimism, Lack, Anger, Frustration, Hopelessness...It goes on and on! Gratefulness can be the cure for all of these and more.
Many people have to go through a major trauma or loss to realize what they had all along. Don't let this happen to you!
Right now, remind yourself of:
The amazing part of the world you live in
The people in your life
Your pets and wildlife in your life
The natural beauty around you
The ability to think, feel and make decisions
Whether you are in great health or not, the abilities that you do possess
The challenges before you that can only make you stronger and more capable
Your ability to choose happiness, love and peace
I know this might sound corny, but give gratefulness a try. Remind yourself every day of all the things you have to be grateful for. Try it for one week, and see if it doesn't make you feel great, and get great results in your life.