This quote means that when we see life as an opportunity to help others, we will find joy and satisfaction. To begin, when we sleep and dream, life can seem like a wonderful and joyful thing. But when we wake up and realise that in order to find true joy, we must be of service to others, it can be a difficult realisation. However, once we begin to serve others through our actions and deeds, we will realise that this service is a source of joy too.