The word muttaqi [righteous] implies the abandonment of evil, while the word muhsin alludes to the doing of good.
I have read an anecdote in this regard. A noble man invited someone to join him for food, and he made all the arrangements for his hospitality and truly did justice in this respect. When they had finished eating, the noble man said with great humility: ‘I have not been able to serve you as you deserve.’
The guest responded: ‘Indeed, you have done no favour upon me; in fact, it is I who have done a favour upon you, because when you were engaged in your arrangements, I did not burn your house down. For what if I had set fire to your property, then what?’
(Malfuzat, Vol. 1, p. 179)