We are considering the Saviour's explanation for rewarding His sheep.
"For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in: naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me," verses 35-36.
Note, everything the Christian does is for Christ. "For I was an hungred, and ye gave me meat, etc."
Paul said: "For to me to live is Christ," Php 1:21. This what ALL Christians should say! Our sole aim in living should be to glorify Christ. He is the supreme End and Purpose of our life.
It indicates a watchfulness regarding the affairs of Christ. Love and concern for the people of God marks the life of the true believer.