Our choices affect others in both positive and negative ways. People are connected to one another in many different and unique ways. For example, a friend of my daughters was supposed to go on vacation with us this summer. This friend recently got into a bit of trouble and is no longer able to go with us. While my daughter had nothing to do with it she is affected in a negative way because her friend can no longer go. Our choices do affect others in many ways. I believe that it is very important to always think of others. When a person is able to do this, they are more likely to make better decisions.
While there are examples to prove the quote valid, there can be an equal number to suggest otherwise. In a different form of the question earlier, I presented the idea that the answer to the topic of whether or not individual actions are done in a vacuum or do have an impact on others can help to reveal a belief in the presence of a divine power. Certainly, this analysis can be provided here. For example, if someone acts in the belief that charity towards others is an essential part to their religious values, it will be difficult to suggest that volunteering time, donating money or effort to a particular charity, or giving support to those in need impacts others around them in a negative way. I am fully aware of the ethical egoist arguments and some of the libertarian arguments against such a position, but overall, I have a tough time seeing someone volunteering at a soup kitchen or another person giving clothes to the homeless on a cold New York night as something that impacts others in a negative way.
A few questions back, someone asked about how our choices impact others and I gave negative examples. You can look there for those negative examples. However, it is by no means true that our choices ONLY impact others in negative ways. I would hope that there are people in your life whose choices have affected you in a positive way.
Just to pick one example, I have had many students choose to let me know in various ways that they have appreciated the ways in which I have acted as a teacher. Their actions have certainly made me feel better about myself. Because I have felt good about myself and about my relationships with students, I think that I have then treated other students well. The actions of the students who have thanked me, etc, have made me happy and have also made me act in ways that made other students happier.