Never take what does not belong to you

Before learning about Buddhism, I used to be greedy. For example, if the hawker gave me more change that should be, I just kept quiet. However, if I was shortchanged, I would asked for the right change.
If we take more than our share, we owe something to the person who gives it to us. We are going to pay back many times in future or in our next lives. So is the working of karma.

If we take the government's property such as paper for our own use, we are owing to the people of the country who pay taxes so that such property can be acquired by the government.

See what I mean. Never take what does not belong to you or karma will run after you and you will have to pay back many times the amount owed.