Called the reserved powers clause, it's actually not part of the main body of the document. It's the 10th Amendment, and put simply, it says whatever is not explicitly stated as a responsibility of the federal government, is under control of the states.
It will make it a lot harder for you to be consistent. Make gradual changes instead of jumping in head first. If you can do something for three weeks, it will become part of your routine. Pick 1 thing you'll work to be consistent in for a month. When that month is up, add another thing to be consistent in. For example: If you have a goal to be a better team player at work, choose a few things that will help you achieve that goal. For a month, practice deferring to others in group projects, or finding ways to incorporate your ideas into theirs.
1 : having always the same form, manner, or degree : not varying or variable uniform procedures. 2 : consistent in conduct or opinion uniform interpretation of laws. 3 : of the same form with others : conforming to one rule or mode : consonant.