The writer speaks of a ruler or other powerful person treating those less powerful unjustly as if he were planting seeds that will give birth to plants that bring trouble. Alternate translation: "If a person treats those less powerful than he is unjustly, they will cause him trouble later on" (See: [[rc://en/ta/man/translate/figs-metaphor]])
The word "rod" is a metonym for power over other people. Possible meanings are 1) the unjust ruler will lose the power that he had that allowed him to treat other people unjustly or 2) when the people respond to the injustice he had done by harming him, he will have no power to stop them. Alternate translation: "he will no longer have the power that he had used to harm people" (See: [[rc://en/ta/man/translate/figs-metonymy]])
The word "rod" is a metonym for power over other people. The unjust man was harming innocent people as if he were very angry with them. Alternate translation: "the rod he had used as if he were punishing people" or "the power he used to harm others" (See: [[rc://en/ta/man/translate/figs-metonymy]])