It means that the didactic education is not very convincing, and it should be the kind of model education that "moistens things quietly". It is also for this reason that the so-called example is better than words. As the saying goes, the power of example is infinite. There is another point that is particularly important. It is often said that there is no education without love. The best education is a kind of great love, and great love does not require return, and it is often silent!