Aspiration is one of the five strengths that allow us to practice our bodhisattva discipline of helping others throughout our whole life. Because you have experienced joy and celebration in your practice, it does not feel like a burden to you. Therefore, your aspire further and further. You would like to attain enlightenment. You would like to free yourself from neurosis. You would also like to serve all sentient beings throughout all times, all situations, at any moment. You are willing to become a rock or a bridge or a highway. You are willing to serve any worthy cause that will help the rest of the world. It is also general instruction on becoming a very pliable person, so that the rest of the world can use you as a working basis for their enjoyment of sanity.
Condensed from pages 74 to 75 in Training the Mind and Cultivating Loving Kindness. Shambhala Classic Edition with foreword by Pema Chödrön.