But if that man increases in knowledge, his happiness will increase, the intellect will open to him, and his sense-enjoyment will evolve into intellectual enjoyment. He will feel pleasure in reading a beautiful poem, and a mathematical problem will be of absorbing interest to him. But, with these, the inner nerves will become more and more susceptible to miseries of mental pain, of which the savage does not think. Take a very simple illustration. In Tibet there is no marriage, and there is no jealousy, yet we know that marriage is a much higher state. The Tibetans have not known the wonderful enjoyment, the blessing of chastity, the happiness of having a chaste, virtuous wife, or a chaste, virtuous husband. These people cannot feel that. And similarly they do not feel the intense jealousy of the chaste wife or husband, or the misery caused by unfaithfulness on either side, with all the heart-burnings and sorrows which believers in chastity experience. On one side, the latter gain happiness, but on the other, they suffer misery too.