When we do not control the mind and just let it be free, then it starts to create all these negative actions and thoughts. That is why in these practices which we call meditation, although there are many levels of meditations, whatever the dharma teachings that have been taught by all the enlightened Buddhas, it is mainly to subdue this mind and to tame this mind. It is to recognize the fault of the mind is conceptual thought, which is a very dualistic thing where there is always subject and object, and this binds us into samsara or cyclic existence. At the same time we try to realize its absolute nature, to realize or recognize this, and that is the most important part of our practice.