Sri Swami Satchidananda's Notes
What is purity of heart? A heart full of tranquillity, full of peace. Having a steady mind, a balanced mind, is what you call purity of heart, Being well-balanced between the dualities: the ups and downs, the pleasure and pain, the profit and loss. If the mind is free from turbulence, then the seer can see its own nature. If your heart is pure and steady, you can see God reflected in that steady heart.
OM Shanthi, Shanthi, Shanthi