Our bondage to flesh and senses along with the mind's attachment to and identification with them, constitutes impurity. Developing purity is one of Hinduism's central objectives and every major yoga puts great emphasis on its attainment. Each yoga has various sadhanas spiritual disciplines for attaining purity of heart. There are four major yogas, each one based on the spiritual seeker's temperament. The goal of each yoga is to join the limited individual with the limitless divine.
Raja yoga is the royal path of meditation.
Raja yoga's aim is to control the vrittis , the thought-waves of the mind, so that the Atman, the divine Self, can shine forth in its own splendor. Niyama consists of cleanliness, contentment, austerity, study, and devotion to God. These disciplines are observed so that the spiritual seeker can be freed from the desires and lower impulses that pull him or her away from God. Bhakti yoga, the path of love, harnesses our most powerful desires to love and to be loved and directs them into a path for God-realization. Bhakti yoga presupposes a dualistic relationship with a personal God, but as our love for God grows we become increasingly aware that the God we are worshiping is really our own Self.