The increase of spiritual strength is possible in many ways. But the root of it is to guard one's speech, that is, not to praise one's own sect or disparage another's on unsuitable occasions, or at least to do so mildly on certain occasions. On the contrary, other sects should be honored in every way on all occasions. If one acts in this manner, one both promotes one's own sect and benefits the other sect. If one acts otherwise, one harms one's own sect and injures the other sect.
Indian emperor, spread Buddhism