Is it lawful to do good on the sabbath rather than to do evil?

“Jesus entered the synagogue. There was a man there who had a withered hand. They watched Jesus closely to see if he would cure him on the sabbath so that they might accuse him. He said to the man with the withered hand, ‘Come up here before us.’ Then he said to the Pharisees, ‘Is it lawful to do good on the sabbath rather than to do evil, to save life rather than to destroy it?’” (MK 3: 1-4) 

It is so natural for us to understand that it is never good “to do evil,” and it doesn’t matter whether it is “on the sabbath” or during the week. But is it also so natural for us to understand that it is always good to “to do good”? Because “to do good,” we need to have open eyes to see if our brother is in need. It could be a good word, a telephone call or some kind of help. 

“Jesus preached the Gospel of the Kingdom and cured every disease among the people.” (Gospel Acclamation)