Shakyamuni Buddha said in the Diamond Sutra that 'teaching Dharma is the highest form of giving.' The Hinduist scriptures also mentioned that ‘giving is the noblest action.’ Jesus Christ also taught his disciples to ‘spread all secret methods they heard to others’. Wealth, power, and fame cannot bring us inner contentment. We need the ‘Dharma’ to gain a content, free and a peaceful life, so teaching Dharma is the highest merit.
However, if we want to teach the Dharma, we should have it first. The Dharma is not in the scriptures. Since the ancient times, great spiritual practitioners all taught Dharma silently inside, without religious teachings or scriptures; that’s what it means by ‘Zen uses no word’. Shakyamuni Buddha called it ‘Buddha nature’, the Christians call it ‘Heavenly Kingdom’, and Lao Zi and Zhuang Zi called it ‘the Tao’. We can have inner peace only if we get the power of 'the Tao that can’t be told of, the Dharma that can’t be copied, and the name that can't be named’.