This sentence is funny. The previous sentence is that the poor can support one's son and the rich can support oneself.

"If you raise your son in poverty and support yourself richly, I will also grow in health." This sentence means that your son should be raised in poverty so that he can learn to be thrifty and self-reliant; while for himself (Lao Tzu), he should be raised in poverty. Be rich and satisfy your material needs. At the same time, I also need to stay healthy and continue to grow.

This sentence is a humorous way of expression, in which "poor to raise a son" and "rich to raise oneself" are joking expressions of two different educational concepts. In the traditional concept, a son should be rigorously trained and cultivated so that he can become a responsible and self-reliant person. "Enriching oneself" is a pursuit of one's own quality of life and satisfying one's material needs.