Hatha Yoga and the Bhagavad-gita.
The process of Krishna consciousness is practical dharana, or spiritual concentration. By seeing paintings of Krishna, we use our sense of sight for God; by chanting and hearing we engage the tongue and the ear; by offering incense to Krishna we engage our sense of smell. All the senses can help us engage in dharana, leading to advanced states of meditation and absorption. The holy name is particularly effective in this regard. That’s why Krishna says that of austerities He is the austerity of japa, private chanting, especially while counting on beads.
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