How can we become more aware of a thought arising? It seems like an underlying reservoir of thoughts is waiting to bubble up and flow just like Niagara Falls. By gently observing but not clinging to these thoughts, we can learn to train our focus on the present moment. Sustained pure attention like the unstoppable flow of the immense falls has a dramatic cleansing effect on the heart with equally transformative power. A talk given during an Ottawa Buddhist Society retreat at the Sisters of St. Joseph Convent, Pembroke, Ontario, Canada in 2009.