Serve others gladly; do not serve with an air of superiority or the sour face or disgust. Let people know that you are genuinely glad at the chance of help. Do everything as for Him (GOD). Leave every thing to the Lord. Be an instrument. An instrument has no likes and dislikes. It is just a tool; be an efficient tool.
(From : Sai Veda, The Word of God, sayings of Bhagavan Sri Sathya Sai Baba)