Jesus said to his Disciples, "You that are evil who know how to give good things....." thus evil was in them, the flesh on the outside is not evil, it can be washed and cleaned, but the spiritual on the inside is, demons and devils too trick and deceive that needs to be cleansed.

Discipline is taught and if not learnt then Deliverance is what is needed, not everyone knows because they haven't kearnt and some people are beyond learning but showing Christ in action then they can see.

Obedience is fine but, "why do I do what I don't want to do but do what is not what I want" temptation within the spirit you see thus demons and devils trying to trick and deceive, discipline will work easily on those who know what it means to do wrong so will be under obedient acceptance.

Crucify you spirit everyday with prayer and thanks giving.

What was back then still applies but nowadays it is much different and the spiritual plays a bigger part as it is more so accepted and understood.