In this paper, I will discuss Peter Singer’s answer to “Why be Moral?”. There have been many debates regarding the “Why be Moral?” problem. It is, however, still unclear whether at least one answer is correct. I take up and examine Singer’s argument. Firstly, I will provide a brief overview of the literature on the Why be Moral? problem, and place Singer’s contribution within the literature. Secondly, I claim that Singer’s argument from a meaning of life does not intend to provide everyone with the reasons for acting morally, as opposed to the standard interpretation. His 1973 article supports my claim. However, in fact, Singer requires us to be moral, which is an apparent contradiction to my interpretation. Lastly, I explain why it is not a contradiction.