The most important desire of all is the seeking of joy. For in seeking and finding joy, you not only find perfect alignment with your Inner Being and with who-you-really-are, but you also find vibrational alignment with all things that you desire.
When joy is really important to you, you do not allow yourself to focus upon things that do not feel good - and the result of thinking only thoughts that feel good would cause you to create a wonderful life filled with all things that you desire.
When you hold the desire to be joyful and you are sensitive to the way you feel, and therefore guide your thoughts in the direction of things that feel better and better, you improve your vibration, and your point of attraction becomes one that will only attract - through the Law of Attraction - things that you desire.
Deliberately guiding your thoughts is the key to a joyful life, but a desire to feel joy is the best plan of all... because in the reaching for joy, you find the thoughts that attract the wonderful life you desire.