Yoga means "union". It is the Sanskrit ancestor of the English work "yoke". Hence it comes to mean a method of spiritual union. Yoga is a method - any one of many - by which an individual may become united with the Godhead, the Reality which underlies this apparent, ephemeral universe. To achieve such union is the perfect yoga.
Excerpt taken from the book "How to know God, the Yoga Aphorisms of Patanjali" (#17013)
