Focus on keeping your spine straight. It is the job of the spine to keep the brain alert.
B.K.S. IyengarIntellectuals tend to be arrogant. Intelligence, like money, is a good servant but a bad master. When practicing pranayama, the yogi [makes] himself humble and without pride in his intellectual attainments.
B.K.S. IyengarYoga is like music: the rhythm of the body, the melody of the mind, and the harmony of the soul create the symphony of life.
B.K.S. Iyengar