Success is directly related to concentration of purpose, thought, and feeling. Concentration, a perennial bestseller, assembles comprehensive methods for building strength of character by taming the natural drifting of the mind.

Concentration means that our life becomes polarized to a chosen purpose, animated by increased powers of thought, love, and will, inspired by a Higher Self with which we become re-acquainted. Includes 36 physical and mental exercises.

Wood studied chemistry, physics and geology at the Manchester Municipal College of Technology. Because of his interest in Buddhism and Yoga, he began studying Sanskrit during his late teen years. He became president of his local Theosophist chapter in 1907 at age 24, then embraced the larger world by moving in 1908 to Adyar, India, the Society's world headquarters.

Shortly after his arrival in India, Wood had begun translating the Indian classics, such as the Garuda Purana. In the late 1920s, he began a thorough study of the Yoga classics with the assistance of several Hindu scholars, leading to the publication of numerous translations of famous yoga texts such as the Bhagavad Gita, Patañjali's Yoga Sutras, and Shankara's Viveka Chudamani. In his commentaries to these translations, Wood tried to make these texts' philosophical ideas applicable to modern life.