Seems simple, yet we tend to forget this. The more different other people are from us, in terms of culture, background, knowledge etc., the more differently they will evaluate our actions from what we think they will.
We might think we are courageous, but other people might see as as craven and vice versa. We might think we are smart, but they might think we do dumb decisions.
This is especially important if you are a leader. If you do not understand your team culture and background, you will have hard time finding a right match of your behavior to their expectations of you.
Does not mean you are the one that has to adjust all the time. But even if you want them to change, you need to start with understanding them.