"Do not move the ancient boundary which your fathers have set"
This whole section seems directed at young people and their hopes to make a mark in the world. The next proverb about really skilled people will not be overlooked. The proverb before this about debt is also a trap that young adults can fall for.
This danger is the danger of wanting to move the fences without finding out why the fences were there. All young people feel that their parents had too many rules and there are too many societal rules. These rules define a culture and how to interact with each other. It is these rules that are metaphorically referred to as ancient boundaries. It seems that all young people want to ask, "Why can't I do that?" "What harm will it do?" And if a medical, scientific, and emotionally appealing answer is not immediately forthcoming, then they are ready to immediately move the boundaries. This is a mistake.
Our day and age has taken this to an extreme where every moral and cultural boundary is being questioned, changed, and discarded. Adultery, homosexuality, swearing, witchcraft, Satanism, stealing, abortion, euthanasia, lying, envy, etc. All of these that were once seen as wrong and do-not-go-there places are now being explored with reckless abandon as though nothing will happen to you. But all kinds of things are happening and the harvest of bitterness is coming.
Until tomorrow,
Gil Stieglitz