Serving another with a gentle and humble heart is giving of yourself without the thought of personal gain. Your only desire is to be a blessing to the other.
On the other hand, when you serve someone without their gratitude for your service, it can be difficult to say the least. It is during those times that I have to rely on the grace of God for what he has done for me. It is a reminder for myself that Jesus did this for me as well, while I was yet ungrateful and selfish.
I am finding that as I grow, modeling is perhaps the greatest witness that I can have. Doing the right thing is sometimes very hard, but God gives one the grace and strength if we ask this of him. A. Thurmer.