The purity of the inner self depends on how much you remember, desire, and think about the Hereafter. Allah says:
"Indeed, in the Messenger of Allah you have an excellent example for whoever has hope in Allah and the Last Day, and remembers Allah often." (33:21)
A few days ago, while I was having my meal during break time at work, there were three other co-workers on the same table who had already finished eating (because they started before me...