Patañjali's Yoga-Sutra

In the Yoga Sutra, the classical work on yoga, Pata jali summarizes the meaning of human existence in 195 concise sutras. They are intended as a curriculum and memory aid for the expert and can be recited in 25 minutes. His telegram style and the ambiguity of the Sanskrit terms lead to the fact that the Yoga Sutra is translated again and again anew and interpreted differently due to the personal experiences of the authors. In the translation of this issue, the keyword character of the sutras is retained and the explanatory commentary is illustrated by examples of the autor's own experiences from over 50 years of practical application of yoga techniques.

The purpose of every system of Yoga is to first get Samadhi and then stabilize it and let it find fulfilment in Unity. Yoga means union. When the mind gets united with Being, this is the state of Yoga. Union is union of the individuality with the cosmic unboundedness. Union is in Samadhi. And Dhyan (meditation) leads to Samadhi. Dhyan is that which takes
the mind from the field of gross experience to the subtle experience, takes it to the quietude of the transcendental area. Dhyan or meditation is a direct way to Samadhi which is Yoga. - Maharishi Mahesh Yogi