The mind set of success comes with practice. Practice speaking truth out loud all of the time. Be sure to take the time needed to be refreshed and get back in the game.
There are many things you can do to get refreshed.
Break up your day
Develop Meditation or Prayer
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Turn it all off "All of It" and un-plug
Drive out of the city with music
There are many things you can do. Stay positive, always put truth and positive words in to action and you will see great results.