Service to one another is an avenue to lay down our lives, and this simply means there is something every brother  has that is a useful tool for service which goes on to establish that the one who is served also needs the service showing that we are not all complete In ourselves (1 Peter 4:10) . 

So we should not be too quick to feel exalted when we are being served and also we should not feel demeaned when we are serving another, these feelings only magnify our lack of love and our depth of Pride and self awareness (Philippians 2:3)