This book entitled Practical Lessons in Yoga consists of twelve easy and interesting Lessons. The First Lesson deals with Yoga and Its Objects. The Second Lesson treats of Yoga Sadhana or the practice of Yoga and contains a clear and lucid description of the four important paths viz., Karma Yoga, Bhakti Yoga, Raja Yoga and Jnana Yoga. One can easily choose for himself a path according to his particular taste, temperament and capacity by a close study of this Lesson.
I firmly hold that no one wishing to become a perfect Yogi can realise his wish, if he does not begin his Yogic practices with Karma Yoga or doing actions for actions sake, without the idea of agency and without expectation of the fruits of his actions. I have also made passing references to the various other forms of Yoga such as Hatha Yoga, Mantra Yoga and Kundalini Yoga.

Yoga Philosophy is one of the six systems of Hindu Philosophy which exist in India. Unlike so many other philosophies of the world, it is a philosophy that is wholly practical. Yoga is an exact science based on certain immutable Laws of Nature. It is well known to people of all countries of the world interested in the study of Eastern civilisation and culture, and is held in awe and reverence as it contains in it the master-key to unlock the realms of Peace, Bliss, Mystery and Miracle.
Even the philosophers of the West found solace and peace in this Divine Science. Jesus Christ himself was a Yogi of a superior order, a Raja-Yogi indeed. The founder of the Yoga Philosophy was Patanjali Maharshi, who was not only a Philosopher and a Yogi, but a Physician as well. He is said to have lived about three hundred years before Jesus Christ.
Patanjali defines Yoga as the suspension of all the functions of the mind. As such, any book on Yoga, which does not deal with these three aspects of the subject, viz., mind, its functions and the method of suspending them, can he safely laid aside as unreliable and incomplete.
The word Yoga comes from the Sanskrit root Yuj which means to join. Yoga is a science that teaches us the method of joining the individual soul and the Supreme Soul. It is the merging of the individual will with the Cosmic or Universal Will. Yoga is that inhibition of the functions of the mind which leads to the absolute abidance of the soul in its own real nature of Divine Glory and Divine Splendour. It is the process by which the identity of the individual soul and the Oversoul is established by the Yogi. In other words, the human soul is brought into conscious communion with God. Yoga is the Science of sciences that disentangles the individual
soul from the phenomenal world of sense-objects and links with the Absolute, whose inherent attributes are Infinite Bliss, Supreme Peace, Infinite Knowledge and unbroken Joy.