Jesus died for us - this should prompt a response in us of love and service to all. It is only reasonable that we do everything we are able to honor Christ with our lives. Being living sacrifices implies that the service we give isn't only going to happen when it's convenient - it wouldn't be a sacrifice if we only gave when it was easy. There are examples of brethren who live lives of service, and we should be inspired by their examples (as well as by the ultimate example of Jesus Christ) and do likewise.
(This sermon contains pictures and updates regarding our brethren in Ghana and Nigeria.)