What is a servant?

Luke 17:7-10 is a very interesting passage of scripture and very troubling to me. It talks of having servants and if a servant comes in form the field and is done plowing you would make him make and serve you a meal so you are filled and feeling good, after he has served the meal then and only then can he eat. This is troubling to me, I am not familiar with servants and what servants do. I don't think like this passage, I try to care about what people may be feeling and how i can help them not how they can help me. Then I think of Jesus and what he asks of us. Doesn't Jesus ask us to be servants for him and his kingdom? Does a servant know his masters business? Look at John 15. Does a servant do his duties to be praised and applauded? I think sometimes we get it all screwed up, sometimes we work, or do a task or help somebody out with a thought in our mind that we want o be thanked. It is good to be thanked and it is good to feel rewarded for your work, but is it the motive that makes you do the task or go to work? What about living for Christ, do you do it for a reward? do you do it looking for recognition? A devotional by Chris Tiegreen says it this way," Our attitude of service indicates the degree in which the gospel has penetrated our hearts." WOW that is said in a humbling way to get your attitude right. What are you doing for God today, this week, this month and why are you doing it? If it is to get a thank you or to get a promotion or to be praised what of that gives glory to God? Those are all self focused and not Kingdom focused. I pray that i may have more of a servant attitude in all I do and let his gospel penetrate my heart.