There are a variety of obligations that we experience in our lives. Familial obligations, legal obligations, financial obligations, religious obligations, social obligations, and personal obligations, to name a few. It is a very difficult task to attempt the complete fulfillment of these obligations. After all, they often end up being in conflict with one another. Perhaps you may find yourself forced to either break the law and protect a family member or uphold the law and let your family member be harmed. Which obligation holds the more compelling interest for you?
But perhaps no obligation is compelling to you. Many people dislike the whole notion of obligation, and even its close relative duty. For most of my generation, duty is equivalent to unnecessary burden, a useless restriction upon the fulfillment of our wishes. Unlike most of my generation, I have a sense of duty that is not restrictive. Duty is the way of living that I have chosen, and that way is to love everyone at each moment to the best of my ability.
For me, love is the only legitimate source of duty, the obligation that takes precedence over all others.