As you simplify your life, the laws of the universe will be simpler; solitude will not be solitude, poverty will not be poverty, nor weakness weakness.” - Henry David Thoreau (Click the name twice for a bio.)
Affirmations work because you are removing the clutter. The more time you spend and more energy you focus on "I am and I can" ... the less time you have to ponder all the ways and reasons that you can find not to be or to achieve whatever it is you have chosen to achieve.
With belief, focus, determination, and action...(non-resistance) you move toward the goal. It is not a striving; rather, a flow. Knowing you are feeding your affirmations with every thought, one becomes more focused on removing thoughts that counter the program.
Simplicity wins. I am Happy... Affirmed. ; )