The Five Grades of Mental Purity: 1. Initially the Noble Learner temporarily disables the mental hindrances and bindings by 'Substitution by the Opposite' using insight: Lust is temporarily substituted by disgust, anger by friendliness, restlessness by calm, laziness by energy and doubt is substituted by certainty. 2. Later the Noble Learner temporarily overcomes the mental hindrances and bindings by 'Suppression' by entering one-pointed absorption of concentration, which is unmixed, unpolluted and untainted by hindrances. (from the Visuddhismagga)