What are we doing, according to Fr. Himes, when we tend to the bodily and mental health of others?  How are we “doing what God is”?

Answer the following as related to the “Catholic Healthcare: Mission and Identity (Regarding the Person)” video:

According to Fr. Himes, in the video, the dignity of the human being is held together in the human being’s ability to “give one’s self away.”  What does he mean by this?
What are we doing, according to Fr. Himes, when we tend to the bodily and mental health of others?  How are we “doing what God is”?