Why not simply honor your parents, love your children, help your brothers and sisters, be faithful to your friends, care for your mate with devotion, complete your work cooperatively and joyfully, assume responsibility for problems, practice virtue without first demanding it of others, understand the highest truths yet retain an ordinary manner? That would be true clarity, true simplicity, true mastery.
Some help others in order to receive blessings and admiration. This is simply meaningless. Some cultivate themselves in part to serve others, in part to serve their own pride. They will understand, at best, half of the truth. But those who improve themselves for the sake of the world -- to these, the whole truth of the universe will be revealed.
The fourth (of the four cardinal virtues) is supportiveness: this manifests as service to others without expectation of reward. (Paraphrased: Such service is not a mere conforming to some external rule of behavior, but instead a manifestation of your original nature).