The Buddha’s fourth assurance is if a person who commits bad karmas does not suffer the related retributions, then the noble disciple is purified anyway because he no longer has any bad thoughts, speech, or actions.

Peace of mind comes to the person who lives morally. Having a pure mind, this person does not harbor bad thoughts, speak bad words, or commit bad deeds. This person’s pure mind has no wandering thoughts or discriminations. It has no attachments or aversions and no craving or hatred. This pure mind is the calm, clear mind that is no longer pulled this way and that by what it encounters. It is the serene and natural state of all beings.