Goodness

Goodness cannot grow and develop unless one leaves evil, in the same way that a plant cannot develop unless the area around it is thatched. The soul and the deeds are not purified until what negates that is removed. A person cannot be purified unless he abandons what is evil. The soul that does not abandon evil cannot be purified at all for evil pollutes and soils the soul. 

 

- Ibn Taymiyyah, Tazkiyah, p. 43-44