The three elements of kriya yoga
The second chapter of the Yoga Sutras opens with kriya yoga. Patanjali names three elements. Iyengar explores them in his discussion of sadhana, or purposeful practice.
Tapas and disciplined action
Iyengar connects tapas with earnest effort and the willingness to practice what we study. When we repeat a familiar posture attentively, we can notice which parts of the body are steadier and where we continue to use excess effort. The quality of the work becomes something we can observe through repetition.
Svadhyaya and study
Svadhyaya includes studying spiritual texts and examining what we learn in practice. A simple reading exercise is to choose one term, describe its meaning in your own words, and check how Iyengar’s examples clarify it. A return to the text can reveal details that were lost in the first paraphrase.
Ishvara pranidhana and dedication
Iyengar describes the third element as surrender or dedication to Ishvara and connects it with turning toward the core of one’s being. The term has a religious and philosophical meaning. Its relation to Ishvara remains part of how Patanjali frames the practice.
An outward action can become an inward inquiry
Iyengar reads the three elements as different depths of sadhana. Tapas concerns the work we actually undertake. Svadhyaya turns the inquiry toward the way we understand that work and ourselves. Ishvara pranidhana gives this inquiry its deepest orientation in the book’s spiritual framework. These levels help explain why Iyengar spends time on all three even when discussing something as familiar as a posture.
Studying a text alongside a familiar task
Consider a reader who encounters the idea of steady effort and then sits in a position they already know. They may find that the effort is uneven. At first they lift their shoulders to feel upright. Later they notice that changing the support under their feet changes how much work the shoulders do. Returning to the book after this observation raises a sharper question about the relationship between effort and stability. In that cycle, disciplined action gives self-study concrete material, and self-study informs the next action.
Why the third element has its own place
Iyengar connects Ishvara pranidhana with devotional language and with a depth of practice that reaches beyond the ordinary sense of being the doer. This is one reason the three elements cannot be captured fully by a routine of action and reflection. The book gives dedication its own spiritual object and purpose. Readers can follow that distinction even when their immediate interest is in how disciplined practice and study help each other.
How the elements fit together
Action gives us something to observe. Study helps us understand what we are doing. Dedication gives the practice its spiritual direction. Sutra II.2 links kriya yoga with attenuating the kleshas and preparing for samadhi, goals within Patanjali’s system.
Source
B. K. S. Iyengar. Heart of the Yoga Sutras.