Here are some inspirational quotes about kriya yoga. You can also read the chapters on kriya yoga from Autobiography of a Yogi and The New Path.

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“The cries of many bewildered worldly men and women have not fallen unheard on the ears of the Great Ones,” [Babaji] went on. “You have been chosen to bring spiritual solace through Kriya Yoga to numerous earnest seekers. The millions who are encumbered by family ties and heavy worldly duties will take new heart from you, a householder like themselves. You must guide them to see that the highest yogic attainments are not barred to the family man. Even in the world, the yogi that faithfully discharges his responsibilities, without personal motive or attachment, treads the sure path of enlightenment.” (Babaji to Lahiri Mahasaya)

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“The yogic key will not lose its efficiency when I am no longer present in the body to guide you. This technique cannot be bound, filed, and forgotten, in the manner of theoretical inspirations. Continue ceaselessly on your path to liberation through Kriya, whose power lies in practice.” (Lahiri Mahasaya)

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“After the mind has been cleared by Kriya Yoga of sensory obstacles, meditation furnishes a twofold proof of God. Ever-new joy is evidence of His existence, convincing to our very atoms. Also, in meditation one finds His instant guidance, His adequate response to every difficulty.” (Sri Yukteswar to Yogananda)

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Referring to the universal need for yoga, and particularly for Kriya Yoga, which guides the energy into, and up, the spine, Yogananda once said.”You can be in a room twenty-years, trying to get out through the walls, the ceiling, the floor. It is when you finally discover the door that you find your way out. That’s how it is with the soul. The average devotee may struggle his while life trying to escape the bodily limitations by unscientific means, and by the paths only of devotion or discrimination. By Kriya Yoga, however, if he is sincere, he can escape quickly. Kriya Yoga takes one to God by the universal highway: the spine.”

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“I can take a few young men of the most restless sort, and let them practice Kriya for two hours every day in the way I tell them, and, without question, in four or five years I can make saints out of them.

“I won’t preach a single sermon to them. I will simply tell them to practice Kriya for two hours a day, and they will see the difference in their lives. That is a good challenge.

“Of course, they must practice in the way that I tell them. That won’t be easy. But it is surely worth the effort.” (Paramhansa Yogananda)