Need some keys points on the topic: The choices we make impact others around us.
So are you just looking for ways to prove this point? If so, think about ways that you act in your own life or ways in which you see other people act.
For example, if you are in a relationship and the person you are with decides to cheat on you, that has a huge impact on you. If you are unhappy because of that, you will probably have an impact on the happiness and mood of your family. So the actions of the person who was in the relationship with you have affected at least you and your family.
Or let's say that you play sports and you decide to go out and get drunk. You get caught and so you are suspended from sports for a time. That affects your teammates, assuming that you were an important part of the team. If they are affected, that will impact they way they interact with others and the effects of your action will spread.
If you're looking for key points that are backed by literary textual support, I recommend looking at Speak. The entire book is about how the choices Melinda makes impact her, her friends, and her family. The biggest choice is her silence, and that impacts the boy who raped her. By being silent, she isempowering him to continue his violent and vicious behavior, knowing he will face no consequences.
Another good text to look at is Macbeth. Macbeth chooses to kill the king and everyone is effected. The King's sons run away, more murders occur, and even the weather and animals around the castlebegin to act strangely or violent.