Every living being wants the same thing - pleasure. We all want pleasure and we all want to avoid pain. We are only willing to experience discomfort or pain if we believe that ultimately it will give us pleasure. This pleasure could be physical, emotional or spiritual, but we all want pleasure.
The reason for this is because we were created in order to receive pleasure. Hashem loves us and wants us to have pleasure and thus we are all pre-programmed to seek pleasure. The test of life is to decide what types of pleasures to seek.....