It is important that when pursing our own self-interest we should be 'wise selfish' and not 'foolish selfish'. Being foolish selfish means pursuing our own interests in a narrow, shortsighted way. Being wise selfish means taking a broader view and recognizing that our own long-term individual interest lies in the welfare of everyone. Being wise selfish means being compassionate.
We begin from the recognition that all beings cherish happiness and do not want suffering. It then becomes both morally wrong and pragmatically unwise to pursue only one's own happiness oblivious to the feelings and aspirations of all others who surround us as members of the same human family. The wiser course is to think of others when pursuing our own happiness.
There are five billion human beings and in a certain way I think we need five billion different religions, because there is such a large variety of dispositions. I believe that each individual should embark upon a spiritual path that is best suited to his or her mental disposition, natural inclination, temperament, belief, family and cultural background.
If you practice in accord with your individual capacity, little by little you will find more pleasure and joy in it. As you gain inner strength, your positive actions will gain in profundity and scope.