[Kriya yoga] has the purpose of cultivating Samadhi as also the purpose of attenuating the Kleshas.
When the vibration of our hearts and the one of our minds are out of tune, a klesha is interfering. In the sutra I.24 Patanjali established the principle according to which Ishvara is that who is not touched by the Kleshas: from this principle we learn that being afflicted by a Klesha means being far from Ishvara.
Though Klesha is not pain, it is the root of the pain, its origin. Some would affirm that the Klesha is the oriental version of “sin”. But sin is connected to guilt, while kleshas have nothing to share with guilt. As sin, Kleshas are embedded in our human condition, but while sin generates guilt, keshas generate pain.
Although our will to keep steady in the path of yoga, sometimes our old habits, our memories and subconscious inclinations (samskaras) can take over, clog our way and even produce more negative karma. Agni, the fire of knowledge, has the power to render infertile our sources of affliction (klesha) through practice (abhyasa) and detachment (vairagya). But this does not depend solely on will (tapas) – an act of grace is necessary to be able to turn the circle of karma from vicious to virtuous. That is the way of Kriya yoga: tapas, svadhyaya and Ishvara pranidhana.
The Sanscrit word “ca”, meaning “and” explains to us that yoga is a twofold path – on the one hand we get away from kleshas, on the other we aim at Samadhi: simple and complicated at the same time: to a yogi, divine realization is a duty and a gift at the same time.