Every moment of mindfulness means the gradual destruction of latent defilements. It is somewhat like cutting away a piece of wood with a small axe, every stroke helping to get rid of the unwanted fragments of wood.
Vidagama Maitreya, Mahasi Sayadaw, Susan Elbaum Jootla, Nyanaponika Thera, Ria Kloppenborg (2013). “Collected Wheel Publications Volume XX: Numbers 296–311”, p.76, Buddhist Publication Society