It is normal that we have the right to protect our benefit. But, in most cases many people wish to take benefit from others, especially the benefit offered to us by others who have a purpose to give. Human heart is greedy, and we are easily induced by the benefit free of charge.
For example, when we go to restaurant to eat buffet. We usually eat more than our stomach can afford. This is our nature of greedy. But, there is a consequence that over eaten will cause us stomach trouble and especially to the old people, illness following afterwards.
Another example happened many years ago in Shanghai. A woman of eighty-six years of age came to China from America to see their friends who were her colleagues of an enterprise where she worked before she went to America in retirement. Just at that time, the enterprise had a body check for all the staff and she, since she was former staff, had a body check free of charge. But, unfortunately, she was told that she had a lung cancer of later stage. By this sudden shock, she fell into deep anxiety and died a week later. She might live longer if she did not take this free body check. Therefore it is better not to take benefit, especially a free benefit which may bring us harm in one way or another.