tapah svadhyaya isvarapranidhana kriya yogah
Discipline Self Enquiry Surrender
The term kriya yoga is describing yoga as a process of personal transformation, which is so much more than just a means to keep us healthy. More than doing something because it feels good (and, hopefully, it usually does) Yoga offers, invites and challenges us to look deeply into ourselves, and our very commitment to our own transformation.
This is not always easy, and does not always feel good in the process. Only through our dedication to look at ourselves, however challenging that may be at times, can transformation occur. This sutras also reminds us that the outcome of that transformation may be (usually is) beyond our ability to foresee, something much greater than we can envisage for ourselves.
This journey of personal transformation is a constant balance between surrender (the serenity to accept the things you cannot change); discipline (the courage to change the things you can) and the importance of continual self enquiry; (the wisdom to know the difference)